Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b49f053a59da0d3…

MALICIOUS

PDF

68.8 KB Created: 2020-11-26 04:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ea39aded3de4e1761bf4f7f97c7d44f5 SHA-1: 1f42df9b49f884fa6033f112de47153cf4e17993 SHA-256: 9b49f053a59da0d30ede857bf262b21bb15cd367dd18f5c0a731cd82e71b3eea
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass external link farm and a suspicious URL, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the presence of external links suggests the document is designed to redirect the user to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafffi.ru/strik?utm_term=plug+and+play+tv+games+spongebob PDF link annotation
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/807944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_5f9d644642ce0.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/f40649b8.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/9034404.pdfIn PDF document text
    • https://peledinupuw.weebly.com/uploads/1/3/4/5/134508745/0f0e4b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_5fb3fd00c60c4.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/8938511.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/fajonubinomeder/mcgraw_hill_my_math_grade_5_volume_2_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/sizigim.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/roblox_mod_apk_latest_version_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/xofamekimarowit.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/dimijeron.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/lion_king_musical_video.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_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 5488 bytes
SHA-256: 57bf6925e1b3deb7d68187374f2b3b36c5d330f897edbbc3853389bdadcc1683
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 10204 bytes
SHA-256: df4c004de0b1803d60d7c7aef7d3731e354af3fa6592834a4fae49898e29af21

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