Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1178477901fb7a7…

MALICIOUS

PDF

78.8 KB Created: 2021-02-18 13:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ed9bb94db86d29e05412b4675ff1aeab SHA-1: 291f169db3b384e58f3c196d863e530fea983194 SHA-256: a1178477901fb7a7771cadafb951f71504808d57c97ef942142c54fa1a2233d1
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded content, though heavily obfuscated, appears to be a lure related to a search query, aiming to redirect users to malicious or ad-filled websites. The presence of numerous external URIs and the ML classifier's high confidence score indicate a deliberate attempt to manipulate search engine results or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=what+is+the+story+of+hansel+and+gretel PDF link annotation
    • https://cdn.sqhk.co/nuvexajamu/ajbhgHI/xfinity_prepaid_connected_no_internet.pdfIn PDF document text
    • https://banukusisazej.weebly.com/uploads/1/3/4/8/134893357/bexejeb.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/c3he6ro/lyrics_mi_musica_favorita_jaime_y_los_chamacos.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/lubaxekinuv-nudorufi.pdfIn PDF document text
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/c283a09e71fbcfe.pdfIn PDF document text
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/ed6eab4.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ifgeejj/50664429452.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/GAPEjdo/29183392934.pdfIn PDF document text
    • https://nuxajitavira.weebly.com/uploads/1/3/1/8/131871558/3611006.pdfIn PDF document text
    • http://apsmall.space/marine_accident_investigation_reportdu5ww.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/6269f39b81.pdfIn PDF document text
    • http://bupetud.xyz/32501751429v1u9w.pdfIn PDF document text
    • http://promooffer.site/zezewupilusabigubokozamazk2w4u.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/ShgXhtG/content_marketing_manager_salary_chicago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/coplanar_waveguide_with_ground.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 5284 bytes
SHA-256: cdc412d9efddd08ba08da7ee1b81c5237ecac557f89a4d61547de3e6334794cf
font_01_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 10176 bytes
SHA-256: bfe0ea244f14c6a424b922a5866e591051d1bac916cc995a882e2bf0ff69b637

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