Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16d50a03c807d37…

MALICIOUS

PDF

83.9 KB Created: 2020-12-25 01:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f662e878b53f13a2233d3f39605c2083 SHA-1: 47c3c96a3ded8268ab10131f8bca209515446b39 SHA-256: a16d50a03c807d37368d54816217c54a75a18da9bfd361d95a87b63b05cf3798
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the document's purpose is to drive traffic to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/aws?utm_term=adblock+for+cm+browser+android PDF link annotation
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/xugotofopelavuduxura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_5fab4ef54d461.pdfIn PDF document text
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/9190643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_5fbddd8ce328e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388063/normal_5fdfa85b277df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5fa41303b1914.pdfIn PDF document text
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/maginiruwup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fe3de085f06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5fc276a21a57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_5fc31ed741fbb.pdfIn PDF document text
    • https://finivoxub.weebly.com/uploads/1/3/4/3/134387593/5034315.pdfIn PDF document text
    • https://fupotitora.weebly.com/uploads/1/3/4/8/134883452/9b2f8a45ff4b60.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/110393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fc8d3fe5c27b.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/xisakazelelinim/55588656263.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/filemaker_pro_tutorial.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 4608 bytes
SHA-256: cfdf9387efa659c5e3cec089396b71fbb7ecfa896f2bd236320306328187ca5e
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5452 bytes
SHA-256: e727e69db8b0366f3199dc80a876be244271ffa046007c42b79f1f8e2a430aab
font_02_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 10960 bytes
SHA-256: c8e45dd2bf0a71da23ee6be72fd6bf0085d7a493b39bd59ba31b61716d24cf4d
font_03_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 16192 bytes
SHA-256: 75ae46b37e824a31f3d2919be60c52daf1ed383ea62173cd6befebe04d4d68f2

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