Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d15aebb21cd2ee0…

MALICIOUS

PDF

79.1 KB Created: 2021-02-11 20:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 76372f0c188901f5510065401171156a SHA-1: d2c8e4b37cbf0714fe4bf8e19fb4612efb6f1c19 SHA-256: 3d15aebb21cd2ee050ed0fccc62f0c0f2308c943119383084f20eeea6aa8cb83
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a campaign that leverages SEO tactics to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/wix?keyword=gps+tracker+app PDF link annotation
    • https://cdn.sqhk.co/seranowe/idhhhbm/31394256509.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/g7djh88/89621216984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_600f9d42261f9.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/4cff3d04c04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fce57e51fba7.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/bezipo.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/misiridikoze_kewisobexilex_jebopaz_wamusekilujep.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/287488.pdfIn PDF document text
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/fedoxabiwori.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/towewulojaj-tuputazuninupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_600ea7d4e81fc.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/wodasigova-bilajowasetot-vegegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_600f0e824f509.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/5514370.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/vatamugefubarox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekaroja.epizy.com/pubg_mobile_wallpapers_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 4992 bytes
SHA-256: 47242ae9f5e30e3fddf07ca60fae0b4fd5e8452ed5dcdf10825b172120e9d453
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 9828 bytes
SHA-256: f9e625169c29a80017de610395c49e24b44abf86f0b12ceb9c7a053ace7fd70b

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