Malicious PDF — malware analysis report

Static analysis result for SHA-256 7368ac4e36928ee3…

MALICIOUS

PDF

66.6 KB Created: 2020-11-14 21:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4d669ec5f7fbab908314b5c7568948e4 SHA-1: 6ed83f924e5ca893c1c6914dc425fca6ca90554f SHA-256: 7368ac4e36928ee31753aee6ebbf848a455edcc3cb2fbb6a33fb5f6d62d06d9f
164 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 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=middle+school+science+bowl+energy+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f9e648987e2d.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/d399845f1a.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/bokugopene.pdfIn PDF document text
    • https://rumorima.weebly.com/uploads/1/3/4/3/134307849/zorupumetoro.pdfIn PDF document text
    • https://zeruxexo.weebly.com/uploads/1/3/4/3/134373455/nadofovet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5f9263615756b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5f958fea9b6a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dadupawo/36540367290.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/manual_for_wizard_custom_sewing_machine_8846.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/mcjrotc_uniform_regulations.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/rabbits_and_wolves_vegan_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/10457011525.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/sufivelamekenojosotinadi.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/chicco_nextfit_convertible_car_seat_infiniti_m35.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/gps_tracker_kinder.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_off0000c603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 5456 bytes
SHA-256: dae347a9d215802b0b7838fa2e1f1264ca74fada63bface51e70af7461da140c
font_01_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 10744 bytes
SHA-256: 8b9058998a67be45c47f02a2bab392d7f49aaa22447686a1896cd4e6568b0fcf

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