Malicious PDF — malware analysis report

Static analysis result for SHA-256 e364fa5306a1c94e…

MALICIOUS

PDF

88.5 KB Created: 2021-05-03 11:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 977147a4a60895dcd6ec63a18067c614 SHA-1: d7fe0a55fe059050db73f24375dd1e5338efdcff SHA-256: e364fa5306a1c94e6c3a954b1151448d50479497d4e45f832579ce37e8a7d6ec
186 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. 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.
  • 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.
  • 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://golowaki.ru/strik?utm_term=whirlpool+quiet+partner+ii+manual+du941pwkq1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457876/normal_601bde1b4fcd2.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/x36gc05/98583167706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6012885aca135.pdfIn PDF document text
    • http://goxutasabadatum.sportsontheweb.net/95183662337.pdfIn PDF document text
    • http://design-kvartira.info/25501060719bd9mq.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/wijpgMl/strike_fortress_box_mod_apk.pdfIn PDF document text
    • http://nefupanono.mygamesonline.org/kakeriwipame.pdfIn PDF document text
    • https://cdn.sqhk.co/wewotiwalote/sjfhbKc/67667586216.pdfIn PDF document text
    • http://belkwigs.com/ncees_reference_manual8oxq1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_4c806be15a814bd689ce52ab30998a3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afc2ac0-3c0f-43f7-b678-7e6efde88370/yardman_riding_mower_battery.pdfIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_8d3b09ee0b85401a9da0e9ccdc4d8f97.pdf?index=trueIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_08f9741383724cfb9e4a29b8c5b4d61f.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_9fa284fb0b4043d09259b72dea8203b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c224f0d-f110-47b9-8c61-cc8aa9dfffe4/kipebosuwe.pdfIn PDF document text
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_471b8a6d201848acab9141bd80f8e612.pdf?index=trueIn 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_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 5612 bytes
SHA-256: c01f7b491e31c4eb641380ef8cae8e89086521a765243081ec794a028d3be7a9
font_01_sfnt_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 12456 bytes
SHA-256: 20dada5c4e4a942f75d924680d5b4e98d522f26c531386f9fb4bf403728de044

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