Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6b6388ecfa0649…

MALICIOUS

PDF

82.9 KB Created: 2021-04-02 04:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e28ea90d8887fb27bb8f2d19c177f8c0 SHA-1: 5b66607b55c51304fa2e5b703e9e0f8adc41e23a SHA-256: 5f6b6388ecfa0649ddea6a7d6f99bd6e0457090abed80e7698f6e928f2de588a
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 0.9948

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://botokaw.ru/wix?keyword=infinite+discontinuity+example PDF link annotation
    • https://figovuliwa.weebly.com/uploads/1/3/4/4/134476313/dufokivaruj.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/7352325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_602661e01eb7c.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/ajh7wig/1486242021.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/64131523135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_601ec72d2cde9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_601100c573a1f.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/1e8818.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/parejas_homosexuales.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/gatunowikipazumufizavim.pdfIn PDF document text
    • http://websecurer.tech/what_are_the_major_themes_of_king_learjjb21.pdfIn PDF document text
    • https://zupusokez.weebly.com/uploads/1/3/1/1/131164352/1a2f5c48863e8b.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/acTxEdr/jopepakigukerekeki.pdfIn PDF document text
    • https://teduzagegoxow.weebly.com/uploads/1/3/4/4/134400331/lawaxapopupisi-ridepopiruti.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/c6d7f121f5.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/ginogajij.pdfIn PDF document text
    • http://usacreditcheck.info/add_and_subtract_fractions_with_like_denominators_practice8ibcg.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/nibixavud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6034dbe0c19e3.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/cmidbgg/car_insurance_rates_california_vs_arizona.pdfIn PDF document text
    • http://topstop.site/cloud_printable_templatexymos.pdfIn PDF document text
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/7031241.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/hihVjdW/55922611187.pdfIn PDF document text
    • http://heretythere.site/am_at_peace_quotes5hh4i.pdfIn PDF document text
    • https://davijonixumitu.weebly.com/uploads/1/3/5/3/135349017/tebiwez-vatomobirokixo-segexal.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/26000166660.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 1872 bytes
SHA-256: cf373f8eb364677dc8d29ae0cbe658a1b8665e9067f0cd69b3a2e84d4b370a53
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 5312 bytes
SHA-256: 7a338ba050b6675f72a1ac9b8a9a851c7fe8b9e2195362a907d066c845a4d0df
font_02_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 12960 bytes
SHA-256: 51967fb8abe991328c7f6288db93852b854b8e8e0d2b7faa737322a7a77f60ad