Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1578907aea514b…

MALICIOUS

PDF

81.3 KB Created: 2021-03-28 10:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b70678c8d830b1bdce061490f8ea9185 SHA-1: bb6f58da7a86a1ee3ed2f112fe6acfa88bc69857 SHA-256: 5f1578907aea514bd6893ba55c934901b68f1493a5f642d1f36a2c1887aae4ee
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, indicating it functions as a link farm, likely to direct users to malicious sites or for SEO manipulation. The presence of embedded URLs and the heuristic findings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=can+i+get+my+real+estate+license+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5fcf207f76e3c.pdfIn PDF document text
    • http://qrastenmap.online/oakville_collision_reporting_centre_hoursqz1pz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_6019fee6115e3.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/5jbPhbt/6103264338.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/fkgemjg/bismuth_crystal_formation.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/ZghzzyM/walkthrough_among_us_guides.pdfIn PDF document text
    • http://znalomstvavip.site/reset_braava_380tbinx3.pdfIn PDF document text
    • http://center-san.ru/how_does_a_two_stage_propane_regulator_workhq7jr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_5fd829c6e95be.pdfIn PDF document text
    • https://xovamiwif.weebly.com/uploads/1/3/4/0/134096018/8257455.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/rikejebo.pdfIn PDF document text
    • https://mojikusabuja.weebly.com/uploads/1/3/5/3/135301399/a52a30.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/QwyNghE/21333916277.pdfIn PDF document text
    • https://sokunikaxule.weebly.com/uploads/1/3/4/0/134017602/2171174.pdfIn PDF document text
    • https://cdn.sqhk.co/mawedabe/VHvv5qp/sojikenaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pobixedele/bopun.pdfIn PDF document text
    • http://rafetomobu.rf.gd/filehippo_kaspersky_antivirus.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/vatorawuwudagikopijexag.pdfIn PDF document text
    • http://rorewoj.rf.gd/68607203998.pdfIn PDF document text
    • http://walefofu.rf.gd/90100340187.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 5032 bytes
SHA-256: 3113d0a55e26c4ab8dcdbabb3d42ca50c9de5b4fa338cf8a5f75a4c0ec4be52c
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 10480 bytes
SHA-256: 8e62e5f34600456821e84b87c84ef537298f59816d3b714ede5c088764d7887d
font_02_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34