Malicious PDF — malware analysis report

Static analysis result for SHA-256 db83f1f79458a7f8…

MALICIOUS

PDF

87.3 KB Created: 2021-03-24 16:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93fd21f718884d17162544579411abb2 SHA-1: 2797b6e9bc491c411aa67b05c2695b642bfc65d0 SHA-256: db83f1f79458a7f80824b067ef371ea90e6b86e1113af9ce222a4ac4df9e49f8
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs points to an attempt to redirect the user to a compromised or malicious domain.

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://dafemum.ru/wix?keyword=letter+of+good+standing+from+bank+uk
    • https://cdn-cms.f-static.net/uploads/4420743/normal_602f14c19e859.pdf
    • http://copyrighthelpbusiness.net/positive_punishment_psychology_definitionslkx0.pdf
    • https://ruzudagozigiwis.weebly.com/uploads/1/3/5/3/135394236/9313218.pdf
    • http://osmosiotzs.fun/eureka_math_grade_4_module_1_worksheetsqynq9.pdf
    • http://zesamoa.online/toyota_echo_repair_manualndhsb.pdf
    • https://cdn-cms.f-static.net/uploads/4458144/normal_602f259dba5e8.pdf
    • https://rovalexi.weebly.com/uploads/1/3/4/5/134598456/d71d9a2ab.pdf
    • http://nebuxopav.mypressonline.com/meduxun.pdf
    • https://cdn-cms.f-static.net/uploads/4502245/normal_5fe81ca7502bd.pdf
    • https://regasefes.weebly.com/uploads/1/3/1/8/131871592/kudomiwotidomeg.pdf
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6030a0b30bf76.pdf
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/donaloxaxelegus_wavibe_tiben.pdf
    • http://glawerry.online/what_is_the_difference_between_latin_and_greek_root_wordsnvf78.pdf
    • https://static.s123-cdn-static.com/uploads/4407998/normal_600343834e68a.pdf
    • http://dressnbuy.com/famabifefanimesuzusapm9580.pdf
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/5917572.pdf
    • http://pugisapi.mypressonline.com/9964452809.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gezetega/radipexexe.pdf
    • https://s3.amazonaws.com/zedilegol/lifujigiganodupexoxup.pdf
    • https://s3.amazonaws.com/juliziwojatige/80517235142.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011771.bin
e578c05037af0f476e334453e355e3860899dc6ae430efc53ac353b094ab95d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 5340 bytes
font_01_sfnt_off00012991.bin
a409c86bdc1fa941f74e6ad5aa83f32b490ed6fa427cfb6e83b198013b44d37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 11304 bytes

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