Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c80cb54eb2699ec…

MALICIOUS

PDF

84.8 KB Created: 2021-06-08 14:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4513ea9a4b6892d4f025d9f3fe903bdd SHA-1: c9076b7cf264cccaa6848a44b14ca7a3bd86d848 SHA-256: 6c80cb54eb2699ecec1db42aa5c4b1f592d5980e6fd020edfbabfc1dead5f360
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://crysiq.ru/pbw?utm_term=brooklyn+nine+nine+cast+age PDF link annotation
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/7ae303a7ef500b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_60219b5463903.pdfIn PDF document text
    • https://gaxepofujar.weebly.com/uploads/1/3/5/3/135348048/aee9b9.pdfIn PDF document text
    • https://vusipesokos.weebly.com/uploads/1/3/4/5/134585271/gefari-vudoloti-xavatelabegak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_6066a7ae88c98.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/menofa_piwamoleninuw_sagawufex_papefesumolarun.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/875f2892ed1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_6046920098d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_60baa70fc9762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwezebom.pbworks.com/f/19083654803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e591a3-c1d4-40f2-b531-4d8265cbaf20/79740126532.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/w/file/fetch/144606033/36961864529.pdfIn PDF document text
    • http://xewubamefa.pbworks.com/f/march_of_the_penguins_movie_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e5f036-3247-4444-9a3c-373ea84af938/kidavoxanujekiwulalilefi.pdfIn PDF document text
    • http://matekid.pbworks.com/f/30696866640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3676f248-beaa-4523-bb82-828da9e7d703/fugexumaxipinutazudugeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e864e40-9cbd-4849-aa0e-232721b5795d/nopitanidobulatedadud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4acea5c4-30b5-4be0-aca2-f22e68ad9343/xutifomoratezateje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e42a93-98bb-4c3e-8502-8b606835379d/lusazaw.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_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 5184 bytes
SHA-256: c7d3fa516e309a151b0bce1a895079244a627ddc107cc28774867f6f53237a47
font_01_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 10572 bytes
SHA-256: 4fc7b2c89ac05dc9c053bac84d50cb3f02f9cf149f78d018d04af857aa739e92

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