Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a256f8b4376479…

MALICIOUS

PDF

82.6 KB Created: 2021-03-18 08:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 977bc013589035c252e32bdd0d1ffe63 SHA-1: 95bfb3404bbda0087c6fe5cb424e250f1704c6a1 SHA-256: a6a256f8b437647964a31be83b81ec68d83f8456ff4e4a9ee74907381e0028fb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/wix?keyword=final+fantasy+x+guide+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405907/normal_602c2417c9d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fe713f197f11.pdfIn PDF document text
    • https://banukusisazej.weebly.com/uploads/1/3/4/8/134893357/731fa94cec8.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/9606bbc444bc.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/ibxhbja/guess_telugu_movie_titles_instagram.pdfIn PDF document text
    • https://nefosedinipal.weebly.com/uploads/1/3/4/6/134698739/6908475.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/hRu3she/download_heroes_of_order_chaos_mod_apk.pdfIn PDF document text
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/1436281.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/mubixabe.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/4533c4b25b1.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/8859404.pdfIn PDF document text
    • https://vasaradafivoza.weebly.com/uploads/1/3/6/0/136048391/vujibixot-potuxawonide-kiwebog.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/0e230c189a.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/zuxasanatakos_tatikedotiwopo_xenojekopupiz_goridelotubuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5febdd41bd4ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386822/normal_5fcda6e3a420b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_60412cfd143d8.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/hmtSot0/stick_unblocked_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_9a1f3ca95904479da60e882b0a136014.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_5f226253386040f481232a58ed8418a6.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_ba467f2df16c42359a4f5afae7eafdf0.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_d4f42ea316744f329522d41e18430374.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_f876afcfc3e540e78a1e80b4cee14394.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 5188 bytes
SHA-256: aa71d22ed747123d45aad21b141675601ba94dc662322a9d5e7ce6131bde947f
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 11332 bytes
SHA-256: 365fbf34a4baeefd8d5c96e1e2045cdbb0eddb43d3a4cd7bcbdecead84986f09
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3