Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf1c83ef9c7b46d…

MALICIOUS

PDF

76.1 KB Created: 2021-05-19 12:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a113956fe4611be9472cb40383b3170b SHA-1: dc9b3890d9eb69e986071fc47e09f1c143deb375 SHA-256: acf1c83ef9c7b46daf917a7e0a9b9ce0613439f5e298b77761a589916221f702
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=what+does+green+poop+mean
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/zekinidiradubujozab.pdf
    • https://cdn-cms.f-static.net/uploads/4479236/normal_60395be514264.pdf
    • https://cdn-cms.f-static.net/uploads/4481830/normal_601fe923ab26d.pdf
    • https://cdn-cms.f-static.net/uploads/4412570/normal_604e1c790d7ce.pdf
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/kiduzi.pdf
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/xogekimepajagide.pdf
    • https://nimijakis.weebly.com/uploads/1/3/4/5/134577625/8853882.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/f54c067c2c01.pdf
    • https://cdn-cms.f-static.net/uploads/4476427/normal_6036957e3eda2.pdf
    • https://cdn-cms.f-static.net/uploads/4445115/normal_601ca1b899358.pdf
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/5171190.pdf
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/giger.pdf
    • https://cdn-cms.f-static.net/uploads/4417536/normal_60603cc12c489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rimejiguvif/86839379304.pdf
    • https://uploads.strikinglycdn.com/files/d70186c9-535e-4b8b-83ec-73bfc38229cc/bulitevegifokiketajovizov.pdf
    • https://s3.amazonaws.com/kujesulad/shoreditch_platform_lounge.pdf
    • https://s3.amazonaws.com/norozovijalu/5774929667.pdf
    • https://s3.amazonaws.com/degagaziv/climatograph_activity_ecological_problems_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/4d34c9fc-40a2-4d31-a2c4-c33a28226456/339949644.pdf
    • https://uploads.strikinglycdn.com/files/a2bff99d-d049-411c-9ec3-ece256aeab80/elect_rachel_van_dyken_ebooks.pdf
    • https://uploads.strikinglycdn.com/files/25368172-f85c-47f2-80c3-8ac6d05584c3/how_does_a_compare_and_contrast_essay_look_like.pdf
    • https://s3.amazonaws.com/bipovoromoj/gegib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf1.bin
a72f2e30f8791d1e49de521946c9dbb80ce7618c674dfd500fc11dc0e99c010c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 5356 bytes
font_01_sfnt_off0000ff0a.bin
d1282bdc4fb15ee229e1de3ecb2665cc7befd27d282d12bd0a790e787c16d052
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 10540 bytes