Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a8e91009bf92e4…

MALICIOUS

PDF

73.4 KB Created: 2021-03-15 20:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04c562a23778ecc29458b97f64574415 SHA-1: 3b8276aeec96a69caf05932eb2e99c31fc2b48d8 SHA-256: 55a8e91009bf92e4612b50e0fcb2b2d524d53e566ebc5b762ce93d560c9754cf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wb?keyword=line%206%20pod%20hd%20bean%20review PDF link annotation
    • https://cdn.sqhk.co/putuziboki/hcWlhhM/11351883298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_60329b78314c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_6027429fa319c.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/74982492442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_600074c3bffa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_60446fbeb9b21.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/jjyt9ja/naxawejapoziwogujibek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6017cb093e422.pdfIn PDF document text
    • http://lotobajigufar.mywebcommunity.org/equivalent_ratios_activity.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/PhjigvH/38011927485.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/OPpUhi6/download_spades_plus_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_5fc7dfb717aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444115/normal_6033a8d80d936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4dcc42f355.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/drXXYib/computer_launcher_apk_pro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_601b609b927f3.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/gshji0T/addendum_to_real_estate_contract_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_ebf5c2ef0aee427da55d8bc3eceb7a2d.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_39e82816f65a4fd298598e101740eb07.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_3b0ac0f702274ef18b1523aab2a66e33.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 5224 bytes
SHA-256: 589c8d26a1b8ffa4296d67385aa002794aa4f5d1d81f59cbe0b09cad69c4d0b5
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 10700 bytes
SHA-256: d71586ab14550864bd7c1533ef84fcf04784155ff8ba5352da20fddc51429c24

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