Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a8a4aec0174108…

MALICIOUS

PDF

71.2 KB Created: 2020-12-29 14:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01b00c8fd1310d5dd20ae567de91ed6f SHA-1: fdebc1be5b55055e83914d0cf5abd4e311281370 SHA-256: 71a8a4aec0174108997c5d205d433fb01a439308d4db35ce0a0a95f3ed7ac37f
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ggtraff.ru/123?utm_term=god+of+war+3+pc+torrent In PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/tetizekana.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/Yrgehe4/79992059486.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/jii8gg0/galaxy_mining_share_price_asx.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/witobebitiwefu_baterewuv_midikizisotofel_jalipirogoje.pdfIn PDF document text
    • https://nomuxivobuga.weebly.com/uploads/1/3/4/4/134483798/fcba6b192654.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/57b5f8578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8584b0-9be0-4c9e-b38c-52595c0686bd/58680209396.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/ketolavuluxadomopavunar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d6e331-266b-4005-952f-83d3956d2094/zubero.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/atomic_weight_of_elements_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/79627489374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dcfe67-1e07-4e12-9e96-09409b4589a1/28667792410.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/acrid_risk_of_rain_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/12523160425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb2b53c-7977-4331-ba45-3ed46119f800/47176983539.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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 5228 bytes
SHA-256: dd089721e92c05d55993a353bdab0368541008f67817d016faeb119915ff0a1d
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 13184 bytes
SHA-256: c2b102e22593fea862bcceb76bf1d6dfdd91d4b2662a953b518a5f56967650f5

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