Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3080394561cac2e…

MALICIOUS

PDF

98.6 KB Created: 2020-12-18 08:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b56e3d4b2c67590e651046a8c55231a SHA-1: 63b7a06851a5ca02549f5d186d3ee4fc50ed99f8 SHA-256: c3080394561cac2ef6a0bfb6d64dd1d15244396f86511776fac519123a0367ef
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=makey+makey+games+to+play
    • https://wotemaruli.weebly.com/uploads/1/3/4/3/134366333/tadifebizujegi.pdf
    • https://cdn-cms.f-static.net/uploads/4418383/normal_5fa51259bb04c.pdf
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5f99e88060de8.pdf
    • https://tovalowu.weebly.com/uploads/1/3/4/3/134375552/majujeraludipi.pdf
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/joxosalazakuju.pdf
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/b3c4207fd7d37.pdf
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5fc177015b865.pdf
    • https://robikonuwobus.weebly.com/uploads/1/3/4/4/134480561/7531332.pdf
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5fa6f33e23bfa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fcf4484941bd0096f28984b/t/5fd21e20a9eaf43bd85cbe9b/1607605794687/80374320282.pdf
    • https://s3.amazonaws.com/tamobalasu/jasper_reports_pricing.pdf
    • https://static1.squarespace.com/static/5fc560a817e720264007f80c/t/5fc817eabbb7f45a927c8e1b/1606948842403/zobaxileber.pdf
    • https://static1.squarespace.com/static/5fc4d58cab79f442f242bf92/t/5fc67e541972c46e3c7f8fe5/1606843990452/36694260321.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1feb352d7073061f173a/1606229995699/new_york_state_hunter_education_homework_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/d6276119-bc44-4913-90b5-37c494f091c4/unfair_mario_cool_math_games.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013940.bin
db17b2af4f7d02e39f7114c9e8320c87b72aae30b409646e6b1bd2092986acb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 4848 bytes
font_01_sfnt_off000149dd.bin
ad911965cccbc70462704df0f8214cc8306d5f079000ce468fd60d7860d70b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149DD 10956 bytes
font_02_sfnt_off00016f42.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F42 4324 bytes

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