Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b94be95f14f0ac3…

MALICIOUS

PDF

145.5 KB Created: 2021-05-09 04:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc107d2b6bf6b203e75f44dae9b6de2f SHA-1: ddc2c75515b305993c33423fa99fec1fb3dbba54 SHA-256: 7b94be95f14f0ac34e69d2dc2f4a15dca5051b06cffba5c7040ef8fdfa88ac74
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards a link farm or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=whats+cell+culture
    • http://kovuzaxaf.medianewsonline.com/how_to_wear_a_face_mask_properly_with_glasses.pdf
    • http://rasipafus.getenjoyment.net/international_business_degree_jobs_salary.pdf
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/5269978.pdf
    • http://ubsvp.com/great_jumping_jehoshaphat_meaningyt7lb.pdf
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/5401258.pdf
    • http://tatanip.medianewsonline.com/look_back_in_anger_john_osborne.pdf
    • http://adv-workshop.site/hide_photo_video_app_apkaukpx.pdf
    • https://cdn-cms.f-static.net/uploads/4366630/normal_604861f38a9e8.pdf
    • http://azalea.store/muzererowozirilabifefjv3b3.pdf
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/duvupel.pdf
    • https://cdn-cms.f-static.net/uploads/4475380/normal_6011ddf7f285c.pdf
    • http://leqqurint.online/how_to_make_your_house_more_insulatedtxczt.pdf
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5ff5c73273de9.pdf
    • https://girakojazesu.weebly.com/uploads/1/3/4/6/134675992/fazobeg.pdf
    • https://cdn-cms.f-static.net/uploads/4473445/normal_601fdb92a4637.pdf
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/busizapavemag.pdf
    • http://ridunculus.com/93798640787fyh7y.pdf
    • https://gedimonisesejed.weebly.com/uploads/1/3/1/1/131163996/11387bf8a7.pdf
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/fddd3a9fea06124.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_9affec3b3a9641cf8d039e12554db5fd.pdf?index=true
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_85aadc2ec824491c9feef72f529dbf75.pdf?index=true
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_abea6cb224b44511a7e6438b9798f136.pdf?index=true
    • http://sewemira.atwebpages.com/molecular_mechanism_of_antisense_molecules.pdf
    • http://kuxoxokazutuv.myartsonline.com/quran_arabic_english_transliteration.pdf
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_971f3b97530e43edaece9cfc9d452bc8.pdf?index=true
    • 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_off0001fe18.bin
27b54f5ff1c24c2be94042a0297feb0a333637ed43f320d83088ba6425edfa18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE18 4900 bytes
font_01_sfnt_off00020ec6.bin
257e85dfe94b13745953ff6d49fc6186cbe4efe2c8768d31a32b501985313044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20EC6 12328 bytes

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