Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cc5469001ae93d…

MALICIOUS

PDF

63.1 KB Created: 2020-11-23 16:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 730d2ecd5cdda970fa07fbe185e8c309 SHA-1: 11eaf426e9a5bba67f5adf8928baaf8417f1e90c SHA-256: 88cc5469001ae93de552136ebeeb3ea147c1a2aa5bd0c1965ebe876840fd77aa
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 are dynamically generated or use numeric slugs, indicative of a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious sites.

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-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://traffset.ru/123?utm_term=shadowrun+4e+arsenal+pdf
    • https://cdn-cms.f-static.net/uploads/4466411/normal_5fa67a57bc96c.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdf
    • https://ginorafixane.weebly.com/uploads/1/3/4/7/134722580/kareg.pdf
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/murezumavul.pdf
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/tisujekivekuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nimuwet/kx-tgea20_operating_manual.pdf
    • https://uploads.strikinglycdn.com/files/6243f532-79e9-4069-919d-f17d18b188f5/77223132715.pdf
    • https://s3.amazonaws.com/tapexiw/50409618197.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/dizovulejiri.pdf
    • https://uploads.strikinglycdn.com/files/1aaa012b-5ae8-4258-9f06-00733411d2ee/wivinaji.pdf
    • https://s3.amazonaws.com/sepawi/holy_books_of_hinduism_in_hindi.pdf
    • https://s3.amazonaws.com/moduxanakuri/bisection_method_examples_with_solutions.pdf
    • https://s3.amazonaws.com/tetazino/9265799523.pdf
    • https://s3.amazonaws.com/wulotugadag/picnic_table_with_attached_benches_plans.pdf
    • https://s3.amazonaws.com/napisakaluja/frigidaire_gallery_series_oven_owner_s_manual.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_off0000baee.bin
5321baee358922aadfda279d8a1424cfc71811c58226198716b7c997d2ba1bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEE 5412 bytes
font_01_sfnt_off0000cd67.bin
598ba1360a3675e26057d0b20702fabf80307dc5f6e108dc67aec64017e31dc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 10056 bytes