Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ff033e4dda93ec…

MALICIOUS

PDF

92.3 KB Created: 2021-04-07 08:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3a277e22314c2e8027ad9ab310114322 SHA-1: a0de89b8b1762a48b563e0d76b6d511649252444 SHA-256: 62ff033e4dda93ec3b01e613f83543504fb37f1262f6cde7572d255b6d291327
300 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, including a critical finding of a link to known malicious redirector infrastructure pointing to 'dafemum.ru'. Heuristics indicate a link farm and a lure for MFA/one-time-code harvesting, suggesting a phishing or credential theft attempt. The presence of a download button lure and urgency language further supports this. Although no scripts were extracted, the PDF structure and malicious links indicate it's designed to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=whatsapp+reborn+v1.80+ban+proof.apk+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460477/normal_600520ecb9610.pdfIn PDF document text
    • http://wexakevo.22web.org/nikozuzozis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_604174c2a9bdf.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/c1e81882ed7055.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/fjLBicn/63835067472.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/gAiiEjf/4_pic_puzzle_answers_level_8.pdfIn PDF document text
    • https://xazalonabi.weebly.com/uploads/1/3/6/0/136086847/8109648.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/hQjf8jj/alienware_usb_mouse_not_working.pdfIn PDF document text
    • https://vajizekof.weebly.com/uploads/1/3/4/5/134594154/pebazugoxo-kazefamarop-puxofifi.pdfIn PDF document text
    • http://nekazupafo.mygamesonline.org/sawoxaluw.pdfIn PDF document text
    • https://gafirupi.weebly.com/uploads/1/3/1/3/131384721/nenetafuka-bopavalekinabat-dixolizekefa-lujage.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/gcha6jj/japifenuvef.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/99486485138.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tidomag.epizy.com/ramayan_song_video.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_c423029baa8d467c8eda8b170cf0dd07.pdf?index=trueIn PDF document text
    • https://9005981c-20a7-4b93-9dfe-a591c0bc6fcf.filesusr.com/ugd/afbba5_17f132861811409f9c272d740147a7c3.pdf?index=trueIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_7e2e4ceafd9f44ea9d1f7331ff6d225f.pdf?index=trueIn PDF document text
    • http://lofomaseforuz.rf.gd/how_to_learn_python_from_scratch_quora.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 5920 bytes
SHA-256: 3cb7faa04aaa111ea2d89139687c4dbfe16fe473a6a4620cc845b6f8bfac3f09
font_01_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 2648 bytes
SHA-256: 21d0e3dd490bcab44f99b6a3cb71772ccab0969bda43ec70ec86efe895514793
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 11524 bytes
SHA-256: c7a4ba09033a58a2f3419b80e375e474d6a23224f381eade3631e2e203c8a198
font_03_sfnt_off00014d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D42 16392 bytes
SHA-256: 1a2cef344135cdcc96c5e1f54e34dedc508871894fe74269a84f378fcf36fd5f

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