Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd683c3a4282e8e6…

MALICIOUS

PDF

86.0 KB Created: 2021-03-17 15:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bd4dc60030577730c981cf0fa908e769 SHA-1: ec5ca7c4ce0ef11d2b634d099a32ee75b1a90f43 SHA-256: fd683c3a4282e8e6e406227c4c9b8f50f61c12607be9d7054a11647ef3b118b1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=one+dark+throne+order PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5ffb91878ce02.pdfIn PDF document text
    • https://cdn.sqhk.co/mevutaxisut/ineXLhc/dibirofodud.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/pigiwotewo_nunuke_zasedonafanuwu_suveweg.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/C5jhshe/steamers_restaurant_hilton_head.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_6030d58d13da9.pdfIn PDF document text
    • http://connexion-amelii.xyz/160525655492noir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_600c68206324d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_603f4c9d5d846.pdfIn PDF document text
    • http://navaram.online/likotilurebijizutuvewwix.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/FRwhanf/download_best_computer_launcher_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/geBIhdP/mizudexapurutakiwulu.pdfIn PDF document text
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/e24641c73a4.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/jgejiii/45173103824.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/aiju5fu/41365746334.pdfIn PDF document text
    • http://vidclips.design/how_to_read_music_for_guitar_bookua2oc.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/5219014.pdfIn PDF document text
    • https://likunemotiro.weebly.com/uploads/1/3/5/2/135299998/6918604.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/iawgeXg/to_mars_and_back_vbs.pdfIn PDF document text
    • http://idealslim-ordina.site/printer_troubleshooting_interview_questions_and_answersndnjd.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/2ea84302-6c8a-4943-bba1-3a1f69ef7919/40_laws_of_power_robert_greene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21b6d45-c9ef-487f-af73-49df71ec20ba/how_to_repair_buddy_heater.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 4792 bytes
SHA-256: b70779ae1c67108a0007a8b65d62a37b7c65f3b350e9536b4e702a48a0f28b24
font_01_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 10816 bytes
SHA-256: 62153ff6dfa271c17baefdc0a9f7feaf4ec3dd4d86fe518f58fe2f8508dcfa9b
font_02_sfnt_off00013592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073