Malicious PDF — malware analysis report

Static analysis result for SHA-256 171e820dea0c10b7…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 06:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b90238064c13b86d00c322f3aa9e37d4 SHA-1: e16e90ee63ee1f9e9d3d91a91ea2e07170222991 SHA-256: 171e820dea0c10b7becfe0da506116a998cecf04066aa3c2dafd2c5786f60db7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to a large number of other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://ponafet.ru/strik?utm_term=agendas+alternatives+and+public+policies+online
    • https://juxagoneponux.weebly.com/uploads/1/3/1/3/131384300/mulamosizi.pdf
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/3539674.pdf
    • https://cdn-cms.f-static.net/uploads/4464709/normal_604bbdf001b2e.pdf
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/147205.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/vijexasovex.pdf
    • http://dasopifumos.iblogger.org/firoxiludajagofusodu.pdf
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5fd9319ccd8e0.pdf
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/2659552.pdf
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/e9bed4f9.pdf
    • https://divojalu.weebly.com/uploads/1/3/4/6/134664609/3145577.pdf
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/migusun.pdf
    • https://lavefikamov.weebly.com/uploads/1/3/0/8/130813740/sobusak_woxozewesaxip_rifuwudanoguxa.pdf
    • https://cdn-cms.f-static.net/uploads/4468530/normal_5fe73690012bd.pdf
    • https://cdn-cms.f-static.net/uploads/4411001/normal_60461c4ae1db6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suwazepomigu.epizy.com/probability_measures_on_metric_spaces_parthasarathy.pdf
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_8e92e8dc481d4f26b7447e695cb3217a.pdf?index=true
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_e4823d37de364ce0ab62230abbe1146f.pdf?index=true
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_e5e4f3a8f26046689f025a182745deed.pdf?index=true
    • http://memavopunon.rf.gd/que_es_anemia_de_celulas_falciformes.pdf
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_a6e6543f04e04fafae9cc0d8ef994244.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_666b2ec25010475fa437fe4d14756bd2.pdf?index=true
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_fddab847d3794122b0f71878c22d29f0.pdf?index=true
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_51b18c7388f24c34afeb89be4418dbce.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_80e04dfe75ca488c9addd482feddbb7c.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_off0000f3c2.bin
e4607fea59d4f304f52dca7366c27758906a0c1a0297d58147d71371e8d3b701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 5432 bytes
font_01_sfnt_off0001064b.bin
a66d05f57e2a6bb6455aec79cb6da48a06562cfcd13ed6d9fd542053b08a94df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 11444 bytes

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