Malicious PDF — malware analysis report

Static analysis result for SHA-256 36deffaeca9fccc3…

MALICIOUS

PDF

77.0 KB Created: 2020-12-28 09:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 89276469f4ac05c8ea544a5ca3e77aff SHA-1: 83c18e0665108a5df8ceb4f543d6384b989ea5b0 SHA-256: 36deffaeca9fccc36498338e9d27a6c4a4ce641b0566894211a060c7367f2a60
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics as a link farm containing a large number of external URLs, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links, some hosted on disposable domains, suggests a phishing or SEO manipulation scheme. The document likely exploits a PDF vulnerability to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://trafffi.ru/aws?utm_term=blue+green+deployments+with+terraform PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5fa99533cbc71.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/iaSESjb/9741324458.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/xugonumugigixosenep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5fb67a0ce79fe.pdfIn PDF document text
    • https://bikukanod.weebly.com/uploads/1/3/4/5/134583710/1884847.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/viayUhc/gukewoganelot.pdfIn PDF document text
    • https://duvonejubuzal.weebly.com/uploads/1/3/4/3/134321315/lemofebolesezor_fozumowam_pipowegatadira_gumunikexej.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/6742854.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/aL6jchc/how_to_list_my_apps_on_apple_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/gNhcig5/sudekovokomili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc763457-14e5-411a-87e3-3d1578809222/37473720352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/058dee24-5592-43e9-a07e-e903eb088021/california_red_sided_garter_snake_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/abcd_movie_songs_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2692a078-aa83-456d-aea9-1b02d8e1909e/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f31cfc0-73f0-4bd0-889c-89e9e92cc972/tafizubozexosifut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94db42b6-461f-4c79-8610-13f520645416/nes._emu_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/bio_data_form_for_job_template.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_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 5700 bytes
SHA-256: ab14517e6d6f0cf9fb808c68167baf58253db362612308c90033831a99c7a052
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 12572 bytes
SHA-256: 0f84baa9d0cf6bb8824da4699fef69c3611ba226a7a0b96b38ef3cc65e5f041f

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