Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38363134b61d177…

MALICIOUS

PDF

72.7 KB Created: 2021-02-14 11:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 82a6eea1f117226399bd4b201cec1701 SHA-1: 1f9abcea187b1024fd29044b99b551481a9ab7dd SHA-256: b38363134b61d177d6b2ef2fe4150fc1ca72418649806e45abeef4a4ca11ba3c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or link farm document. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports this assessment.

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://baarspo.ru/123?utm_term=vinetics+skin+cream PDF link annotation
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/a3f121b3df6.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/gdhihi3/7704952987.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/sigisab-potelironadusaw-gedinigubab.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/5573643.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/kowadipu_lubobu_sadopit_xujowoji.pdfIn PDF document text
    • http://helpcopyright-service.com/barbie_girl_full_song_freeiezt0.pdfIn PDF document text
    • https://mexulurobe.weebly.com/uploads/1/3/6/0/136057308/sukokukuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_5fd2881658885.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/63649451641w6rcv.pdfIn PDF document text
    • http://walkover.me/physiology_textbook_by_sembulingamtmhh1.pdfIn PDF document text
    • http://homebig.space/typical_retail_interview_questions_and_answersuddis.pdfIn PDF document text
    • https://voxujoponita.weebly.com/uploads/1/3/1/6/131607404/805491.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/jf7jgrE/siwopuwudoveto.pdfIn PDF document text
    • https://cdn.sqhk.co/xoresarib/jgTLSif/gowavimusetenifivob.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/xufujofaleki/idsa_cap_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/8954211605.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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 4944 bytes
SHA-256: 10c69ca7d754724301adfef9e8171c39f6251e9d0bf357e0cf8b6f358a4187fb
font_01_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 2004 bytes
SHA-256: b6a380230f9ede48da85807227f7ec054f0bca1c6b971c931427f60f2039e300
font_02_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 11108 bytes
SHA-256: d54060ee0d76195e796ab8a4f5fb354ec95d40871a8adea152dec4a0e99fe17c

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