Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac14a66c976d6919…

MALICIOUS

PDF

78.1 KB Created: 2021-03-09 11:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec75e74195373ad9abc59d90907cb41e SHA-1: 15ff43b61c421e33696fa826b5419805ecfb4c62 SHA-256: ac14a66c976d6919182c626a6ae116b7737749b5bcdb0b87173bf1cc22afe288
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. One heuristic specifically identified a large number of external PDF links, suggesting a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=nonprofit+accounting+for+dummies+pdf
    • https://static.s123-cdn-static.com/uploads/4479688/normal_5feef7d804530.pdf
    • https://cdn-cms.f-static.net/uploads/4502175/normal_6013c088836fc.pdf
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/lusaben-wevesom-vafagawutovo-jexaf.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_603b979aa0be9.pdf
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/1606826.pdf
    • https://futokodoneru.weebly.com/uploads/1/3/0/8/130814407/5133081.pdf
    • http://mailedflkf.site/sefizegrzr6.pdf
    • https://cdn-cms.f-static.net/uploads/4447888/normal_601618c0e25d9.pdf
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/002acecdff7a40b.pdf
    • http://vekvelo.ru/lirademiwaluxitegemulitn2y8.pdf
    • https://static.s123-cdn-static.com/uploads/4446497/normal_60006a9f88280.pdf
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fcd57d63bdc3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gesuposobevexo.rf.gd/nazowazawovobu.pdf
    • https://s3.amazonaws.com/dejazuvorira/3631105383.pdf
    • https://s3.amazonaws.com/zisulamisozoto/kavap.pdf
    • http://vepisesilutez.epizy.com/58402520823.pdf
    • https://s3.amazonaws.com/widuxade/82122393331.pdf
    • https://s3.amazonaws.com/kovezodepugov/cfmoto_650nk_performance_parts.pdf
    • https://s3.amazonaws.com/tapexiw/baguxodopigiv.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_off0000f575.bin
8dc17413a961f431a98caa9d397b0742a1d19fd40afaefb47f6d16583cd70c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 5412 bytes
font_01_sfnt_off000107cd.bin
ded9856c3a8f27fba72dc617bb179819b15ca319b163dc8fbd02ef7d295384f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 10368 bytes