Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be7a666e5fc58c3…

MALICIOUS

PDF

74.1 KB Created: 2021-06-04 14:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ecf45795d43ce541dc02583fc34a92 SHA-1: 4c37dd18bbb93e3c8cb00445ab3e3a514c0e72f6 SHA-256: 2be7a666e5fc58c37e466e6962aa193a6ea6d322907f5e629b08534a36fba0b6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://laborke.ru/pbw?utm_term=niagara+falls+casino+open+or+closed
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/8169129.pdf
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/26077.pdf
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/nuturowamefuweki.pdf
    • https://bobubimusibobu.weebly.com/uploads/1/3/4/7/134715312/3aee82c7e7b.pdf
    • https://lolipakefupixo.weebly.com/uploads/1/3/4/6/134614949/kepigukuvi_gupipajasoziluf_japeputifim.pdf
    • https://nebavorod.weebly.com/uploads/1/3/1/4/131406600/tezananapafu.pdf
    • https://xaviloxoganobe.weebly.com/uploads/1/3/1/3/131383750/d7a8114df501b.pdf
    • https://lodoxile.weebly.com/uploads/1/3/4/8/134896768/c95b3962.pdf
    • https://roxoxurapu.weebly.com/uploads/1/3/4/3/134307884/e922ba174.pdf
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/duzapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://joxupakager.pbworks.com/f/fonaxekeruta.pdf
    • https://uploads.strikinglycdn.com/files/f6bf9f6b-bf76-4bf4-a4a8-5b95653c79cf/37759876022.pdf
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413703/86359806673.pdf
    • http://jujirafamena.pbworks.com/w/file/fetch/144466002/download_dragon_ball_budokai_tenkaichi_4_pc.pdf
    • http://pokuwatosat.pbworks.com/w/file/fetch/144555702/88498762130.pdf
    • http://taxexuwej.pbworks.com/w/file/fetch/144585606/contoh_active_and_passive_voice_present_continuous_tense.pdf
    • https://uploads.strikinglycdn.com/files/7da57548-9161-4833-a577-b670a9bc1859/shimano_bantam_b-100_mag_parts.pdf
    • http://savavaze.pbworks.com/w/file/fetch/144470001/pogil_activities_for_high_school_biology_ecological_relationships_answer_key.pdf
    • http://gepefupugalu.pbworks.com/w/file/fetch/144509223/17440637271.pdf
    • http://vulazojab.pbworks.com/w/file/fetch/144546534/pro_warm_underfloor_heating_thermostat_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e379.bin
d9b02ac52b4d1727cee1c890cf914c278a34f388ac50bec8dad47c8615cde436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 5292 bytes
font_01_sfnt_off0000f595.bin
7500e5f256ab0418d2aeb1a070d9f07cfb658fc427c33e985ce6ee091895c3d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10964 bytes

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