Malicious PDF — malware analysis report

Static analysis result for SHA-256 f142664ec61be945…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 19:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc9ac6a5d31a9a974ab7c7c9cd677d1 SHA-1: d87979ecec47025bd1b3261231a1e84daedcc6b2 SHA-256: f142664ec61be94586aacae54f180a2e203e8bd285eb38fb9cb87a946d1016fb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jacksth.ru/strik?utm_term=graphic+novel+vs+comic+book+vs+manga
    • https://disemorabegelam.weebly.com/uploads/1/3/1/3/131383982/lezuv.pdf
    • https://cdn.sqhk.co/gaximeme/jjfNugi/31257887269.pdf
    • http://gojevomarokabe.getenjoyment.net/27839538831.pdf
    • https://cdn.sqhk.co/vudupapuj/hUFlkgg/kajun.pdf
    • https://cdn.sqhk.co/tategupet/Djcxbge/pewogozikebomoxizezafi.pdf
    • https://pakipetunora.weebly.com/uploads/1/3/4/8/134881281/7e99414a44e69.pdf
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/sabur_xodebiserisago_degetuda_kigexuduxekazev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juwofuxufijup/accreditation_now_critical_incident_reporting.pdf
    • https://s3.amazonaws.com/xefejevife/apache_pc_game_free.pdf
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_8255ae911f1e4822882137037778d487.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25de6a74-fec1-4c16-a4a6-d59f0dae287f/jupapewekazitefilezezul.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_f09f410e8aa54d94852180aef9cdd054.pdf?index=true
    • http://fadezanunadafik.myartsonline.com/83612335829.pdf
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_5e04371eb74047e386058c65bb7820cc.pdf?index=true
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_229b170246114d7f96a5dfcc8e9ccd41.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f85c71b4-d2fb-48da-91fa-2eb114c57ac5/program_excalibur_car_alarm_remote.pdf
    • https://s3.amazonaws.com/gateme/jimixozakenu.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_off0000f567.bin
8b6a03cb7d39dfd9b3ca8ebdbc7516c2dc2e8a1f26648fb6647501d6fad15df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 5644 bytes
font_01_sfnt_off00010873.bin
c31841192fa63738269fcfadb2048ce0e399d5a108b28a7d125d995e8ee0b50d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 11480 bytes

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