Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af882dba6a3460c…

MALICIOUS

PDF

74.5 KB Created: 2021-02-10 10:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7f2353f4f8eeb41b566d2ad5d59e4f19 SHA-1: 2a280591e97b452d56958fad012a9389cabcd6c4 SHA-256: 3af882dba6a3460cb5d9ca843c13226803a2b35c5ef5972fc99fa7710c899dbf
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious 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://baarspo.ru/123?utm_term=como+esta+formada+la+uretra PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367311/normal_601652a1ebf44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_60144220c50ff.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/xaxejuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5fe9cfe38d2dc.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/d8665f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392209/normal_60061c4479209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_601022d9f3e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_601f733a411dd.pdfIn PDF document text
    • https://jukudedavat.weebly.com/uploads/1/3/0/9/130969580/c1d68e.pdfIn PDF document text
    • https://zefimaral.weebly.com/uploads/1/3/0/7/130776827/palafevope_sidaxesirowega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5feef2c282c14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481828/normal_5fe31ac979213.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/gogunabones/kutuwowo.pdfIn PDF document text
    • http://bubewap.rf.gd/45361846271.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/hindu_arabic_worksheet_for_grade_3.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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 4960 bytes
SHA-256: e646f2bbe4232c92015d6928aceadafddaf3d08f904a3df994b39e1910a4e476
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 12468 bytes
SHA-256: 43ff90254428ccb2c36480931496b5e2e1779f9cb292c3c5bc0fb1d20157cd99

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