Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af481c8f749785b…

MALICIOUS

PDF

88.2 KB Created: 2021-02-21 19:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 17dc42b0ed625dd1b38e5e2e4dcf544c SHA-1: e90981ad69065249e183c2bc287cbeeca9d8f3ff SHA-256: 3af481c8f749785bc90206d6e7a605792a223f1783a6034b91d21252615b57f1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'maypoin.ru'. Heuristics indicate this PDF is a link farm hosted on disposable domains, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The document body, though heavily obfuscated, appears to contain product-related terms, suggesting a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=vitamix+5200+prices PDF link annotation
    • https://mifabawir.weebly.com/uploads/1/3/0/7/130776047/desuvovidupili-totakuxa-nivazalawimezut-baxopowake.pdfIn PDF document text
    • http://katermore.ru/74903540438gdm62.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/vomuwerubizavexiku.pdfIn PDF document text
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/989f6279619b.pdfIn PDF document text
    • http://profer-opt.ru/6826085444spy89.pdfIn PDF document text
    • http://cetop.xyz/craftsman_2500_psi_pressure_washer_hose3ejpe.pdfIn PDF document text
    • http://eeeeeyyy.space/fiburigasazezevutow7ust.pdfIn PDF document text
    • https://cdn.sqhk.co/wukiratuxazo/VgfhaR7/66092437884.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/walobopamuk.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/jdkiaha/20857381509.pdfIn PDF document text
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/rupexubibujulaw_vexukiwawo_wirajatiwudaze_xazite.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/votubukaxogilix/fifivovanabe.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/63113989904.pdfIn PDF document text
    • http://fejivexol.epizy.com/poluralopisebebo.pdfIn PDF document text
    • http://tepimajasajuk.epizy.com/55009139741.pdfIn PDF document text
    • http://fiwusinuba.rf.gd/chest_parenteral_anticoagulation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/xinibeluwanoxumubezugiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/what_to_write_appraisal_form_comments_example.pdfIn PDF document text
    • http://wosikomalaza.epizy.com/agatha_raisin_and_the_haunted_house.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 5480 bytes
SHA-256: 16b9a1a8ad3bc91d6d1ba338cce6a3ffd58e006d1f60c6a31c94f0f11f013e5b
font_01_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 10756 bytes
SHA-256: 8e6b631dad87c4b8bbae4761d579acad86836d61a05ff5ed3b1f4b4a8567cf35

Open this report in the interactive analyzer, or submit your own file for analysis.