Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29a8508aca40c17…

MALICIOUS

PDF

74.3 KB Created: 2021-02-28 06:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d9462fcfb36f4203007d567d0553587e SHA-1: 21b2189a82215b8e2aa07cdd2880f60157e94ae1 SHA-256: a29a8508aca40c171884620e9077f2641935db12ba3d1f27a4f3063a0af47359
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards the document being used to drive traffic to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://golowaki.ru/strik?utm_term=how+to+remove+electric+stove+top PDF link annotation
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/267601.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/xuwagulamigeni.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/9d4deb75e9873f.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/fibafovinemamag.pdfIn PDF document text
    • http://goguduve.iblogger.org/kokijujixusoka.pdfIn PDF document text
    • https://jirewolekaza.weebly.com/uploads/1/3/4/3/134387643/02c8171f04.pdfIn PDF document text
    • http://llloooodddd.space/60167079444ffqei.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/43b3d15.pdfIn PDF document text
    • https://rirenumu.weebly.com/uploads/1/3/4/8/134884077/kefofokaxoluw-xovavo-ganuwaja.pdfIn PDF document text
    • http://gebojujefe.22web.org/how_much_does_a_microbiologist_earn_in_nigeria.pdfIn PDF document text
    • http://tamowigaxijatot.66ghz.com/sugomakugitujafuru.pdfIn PDF document text
    • http://detonic-buy.website/reporter_jobs_in_coimbatoreq6n2f.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/legobegutulo/cambridge_igcse_business_studies_second_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/bukunmi_jantolo_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/lagu_namie_amuro_can_you_celebrate.pdfIn PDF document text
    • http://xaxubel.rf.gd/annelids_segmented_worms_worksheet.pdfIn PDF document text
    • http://joxumokuri.epizy.com/jovadudiwokagevenofekuja.pdfIn PDF document text
    • http://wuliwopiveti.rf.gd/how_to_fix_hamilton_beach_flexbrew_leaking_water.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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 4984 bytes
SHA-256: 4ec91daee8f6f2f64b76300be1d7e3c63697a43994d7c8c98303d23dbdb23f71
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 10652 bytes
SHA-256: 85f963dbb79cd825f7de12c7cb51875417fadeb3f3641aa9877c114d9ea15954

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