Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3610917f33a4c5…

MALICIOUS

PDF

64.9 KB Created: 2021-02-19 11:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f1dfd556b115877faa7e59a42a7bc87d SHA-1: cca31b9f8d3b38f5044c5331e12e8ee6f64d5113 SHA-256: 3a3610917f33a4c5e9de01069daba3d994db41814487e21dabd9e3a6a5d54e33
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains and Weebly subdomains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to 'geometry textbook answers' and 'wkhtmltopdf', indicating a deceptive pretext for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=geometry+textbook+answers+chapter+1 PDF link annotation
    • http://remastacer.com/alien_swarm_free_for_pc8ix2s.pdfIn PDF document text
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/6798924.pdfIn PDF document text
    • https://fevegukiso.weebly.com/uploads/1/3/1/4/131482975/2173164.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/9a652.pdfIn PDF document text
    • http://medyayazilimtr.com/90220167055zqjlb.pdfIn PDF document text
    • https://fogufapepupol.weebly.com/uploads/1/3/1/8/131871477/fc5a38c00895.pdfIn PDF document text
    • http://detonic-romania.website/47266642635zs5xn.pdfIn PDF document text
    • http://italylife.pro/34938042004lz45u.pdfIn PDF document text
    • http://erogan-columbia.site/the_mortal_instruments_film_reviewagmpe.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/wemazun/rokaxes.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/xampp_64_bit_apache_friends.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/powerpoint_templates_ms.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/fountas_and_pinnell_leveled_book_list.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/gatorixalorumakitakepi.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/mutev.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_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 5688 bytes
SHA-256: 4170bbd26c36945cf900698c0c4ca0747c3325ae14df49a7664dcf2d99f230a2
font_01_sfnt_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 10360 bytes
SHA-256: 1ca4427ddd3312541beae9b6b3d03207f079b1d225b785250838b857f5be4439

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