Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fbda5ac0269468…

MALICIOUS

PDF

115.8 KB Created: 2021-03-29 09:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b880926098ad28b1eeccbe3fded381d SHA-1: 3afc63653b5d92acd169bf969349ea2c27e8445c SHA-256: 11fbda5ac026946841350c0d1b67dd081ffc22abb87938f6a83945fa81301501
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the PDF, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute links across disposable hosting. No scripts were extracted, but the presence of many URLs points to an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://pelibifir.ru/wix?keyword=scranton+business+park+5+families
    • https://cdn.sqhk.co/kurotevu/hija9he/mix_colours_to_make_dark_green.pdf
    • http://baltika-trans.com/dell_mini_operating_system_not_foundbyxr0.pdf
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6038cf3b66b84.pdf
    • https://cdn-cms.f-static.net/uploads/4450889/normal_5fd124b781ed1.pdf
    • http://manthoughtswebsite.website/discovering_our_past_a_history_of_the_world_answer_keyq4bwp.pdf
    • http://timecodes.net/noco_genius_g3500_not_charging28qnc.pdf
    • https://cdn.sqhk.co/lepavenujal/iakjejb/space_engineers_hydrogen_engine_efficiency_mod.pdf
    • http://impergamon.com/walmart_pharmacy_refill_prescription_onlinerkfkc.pdf
    • http://apelsins.space/filuxixudojaxv3cqa.pdf
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5ff59a3b837ac.pdf
    • http://eslivdrug.space/fl_studio_12._1._3_crack_onlyymxrj.pdf
    • http://sudilufib.getenjoyment.net/bank_of_america_balance_sheet.pdf
    • https://static.s123-cdn-static.com/uploads/4394072/normal_5ff19b9b1dd51.pdf
    • https://static.s123-cdn-static.com/uploads/4416502/normal_5fc98fcac30f3.pdf
    • http://theraisins.pro/short_personal_statement_of_faith_examplesdphmo.pdf
    • http://flipping-car.online/51712261803vt4ct.pdf
    • https://cdn.sqhk.co/bisulalu/p1Ejhji/wobat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://mekasesajiw.onlinewebshop.net/97164842532.pdf
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_bbb29ae8ff6c4b43b6e5e495869704e0.pdf?index=true
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_a6ddaa52ed2e447bbf1216fd6fd619b1.pdf?index=true
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_cd645d3e4db04f8a8c43ac35a8bd5e31.pdf?index=true
    • http://muvipej.atwebpages.com/17999861591.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000177ca.bin
45d3e5d11e044b9d9e8388a82a7c9c3991363a3e12dc3885eb50f0f73181bf2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177CA 5476 bytes
font_01_sfnt_off00018a4c.bin
db6874927bf321961ea3c1cd7f3e7787855d7b8da53c2541a28bfd508f491895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A4C 11932 bytes
font_02_sfnt_off0001b2fd.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2FD 4324 bytes

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