Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc85f57c71dd9c84…

MALICIOUS

PDF

75.7 KB Created: 2021-05-21 12:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cc0e93ef094189881529d0bd43d32693 SHA-1: 97f6971db917de23a43c68716975a5fc7442575d SHA-256: bc85f57c71dd9c84c2f9000ff239847cf588fb41f788f3401574cf5873e48725
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and contains a link farm pointing to multiple external PDF files. The document body suggests a lure related to '12th mark sheet 2019', likely intended to trick users into clicking the embedded links. The presence of external links and the overall structure indicate an attempt to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=tn+12th+mark+sheet+2019 PDF link annotation
    • https://mozeduxazos.weebly.com/uploads/1/3/4/0/134018133/wilofotix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5fdb2eeda0cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_60260a0a4a062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd2875c8aafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_6034ef686f903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ffe1b12c89e3.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/fademedujelofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_603cc648dc361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_606965901d6ec.pdfIn PDF document text
    • https://jirugewozori.weebly.com/uploads/1/3/4/8/134898712/bofen.pdfIn PDF document text
    • https://vebusigatibata.weebly.com/uploads/1/3/4/3/134321359/93d335233cfaf.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/6256895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_6019204b4a905.pdfIn PDF document text
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/dubabatusunuruxub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_600c3feb580b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_6026618156653.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/rizezobabub/luwubuvanavubati.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/suunto_ambit3_peak_sapphire_blue_hr.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_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 5388 bytes
SHA-256: ea23cf32a344de28adbc4a1e1b123b2f8f6c3fadd52edfe44fb5a420618d6581
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10304 bytes
SHA-256: 9c84905336f119997eed01e720f2bc63b6a251f22777dd4bf3268893facc4f95

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