Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c56339c9b6d8ca…

MALICIOUS

PDF

74.8 KB Created: 2021-01-03 03:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6dc4e7cee28955f8692c2a922dd45a98 SHA-1: 59866462342e6e351d1d61fd9033b134751e807c SHA-256: a7c56339c9b6d8cada4d59df12ab855d17c0dd42a1e48a87b7f1db7bd4e5d710
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing or link farm campaign. It contains a large number of external links, many hosted on disposable domains, designed to redirect users to various websites. The primary lure appears to be related to 'video chat apps like omegle for android', suggesting a social engineering pretext to drive traffic to potentially malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?utm_term=video+chat+apps+like+omegle+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fe781325e592.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/jgXAgez/11549344913.pdfIn PDF document text
    • https://jopojikifereter.weebly.com/uploads/1/3/4/5/134519769/lejufurenosomodebive.pdfIn PDF document text
    • https://tuwikoli.weebly.com/uploads/1/3/4/3/134312541/7efc7a87e0.pdfIn PDF document text
    • https://fojogozad.weebly.com/uploads/1/3/4/7/134704798/1167566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5f94766bedd81.pdfIn PDF document text
    • https://nodemexawek.weebly.com/uploads/1/3/4/3/134331915/7971875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5f95abb3c0fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fba8e1306239.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/RJuWq6G/rapanafenile.pdfIn PDF document text
    • https://dinelelulom.weebly.com/uploads/1/3/4/3/134308509/a9acf5b74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d85219-5226-44b1-9b90-4ba24548c176/sipovemogova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ce55c4-425d-4801-b756-03923035c8cc/bartels_funeral_home.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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 5600 bytes
SHA-256: 3ac6fcaf416cfca5b16c09fb3da02c9e2aade967282fa13030b8fd653199a176
font_01_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 10924 bytes
SHA-256: 356f2d85e44cff63f6f91b40d5185e842f4a99d2c75a31a126def2104a989fd1

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