Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf6062ec739fd3e…

MALICIOUS

PDF

79.7 KB Created: 2021-02-27 16:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da4268ace21a0c53344b36c4d0495352 SHA-1: 5c255f89900699c301f787238c108c946e3d0d6c SHA-256: 1cf6062ec739fd3eeedad4e5ff2080e779130f7535f3a67f3cd02e23a87f1643
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=how+to+use+waterpik+water+flosser+youtube PDF link annotation
    • https://kuvitoguke.weebly.com/uploads/1/3/0/8/130813837/bunokebamebipi-zupamanule-ritupekiwusox-gekewolo.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/6139c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_60110073322c1.pdfIn PDF document text
    • http://babudategajuzul.iblogger.org/first_aid_training_schedule_2019_philippines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_603535471ef14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_602b064b27828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5fcc0cdff3d3b.pdfIn PDF document text
    • https://fisabovetusita.weebly.com/uploads/1/3/4/5/134597566/roxavirekazubi.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/7808252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_6037b6dda011e.pdfIn PDF document text
    • http://bevubexawaxuro.22web.org/39839351627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fc98951e2e47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5ff036ba7e9e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_601092be17069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5ff19bbcc6faa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwatimab.atwebpages.com/summon_monster_pathfinder_guide.pdfIn PDF document text
    • http://gonezoz.rf.gd/hirepro_aptitude_questions.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/jizebonuwenizelarobix.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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 5256 bytes
SHA-256: cf51ab7b32ed0abc39764a370922542b009fe9a58ce2bbdbea9bdde65e203939
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 11704 bytes
SHA-256: 9707cc40c88cc11b4191132e30b7d5438e599a693ee54ccfb1887c5011434635

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