Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c76bf898786c04…

MALICIOUS

PDF

76.9 KB Created: 2021-02-28 00:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 287118ad34e0512b75dcf7bad66a5ff3 SHA-1: 234285e1e5793c5abfa9d5a6951b4b70604470d6 SHA-256: 52c76bf898786c041dc50a264783aad058beff4e772ca30d612cf3c293a14179
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=free+acoustic+guitar+lessons+for+intermediate PDF link annotation
    • http://bella24.xyz/download_age_of_empires_2npayq.pdfIn PDF document text
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/2624976.pdfIn PDF document text
    • http://skidki-day.shop/97023684773yh0sh.pdfIn PDF document text
    • https://lufiwusogak.weebly.com/uploads/1/3/4/3/134319395/rimuzosa-lovorenemiziwu-fowibuse.pdfIn PDF document text
    • http://polizoriv.iblogger.org/xopukuvinesebemawowaf.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/koxirapedevujed.pdfIn PDF document text
    • https://sowubibuf.weebly.com/uploads/1/3/4/3/134308786/wulenegaxiw.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/zurexejajukogob.pdfIn PDF document text
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/3595594.pdfIn PDF document text
    • http://niwobupiku.iblogger.org/what_is_a_functional_structure_in_business.pdfIn PDF document text
    • http://medtechnika1.ru/38469927980ej9jd.pdfIn PDF document text
    • http://azorocheat1.xyz/guitar_chords_fullbilrt.pdfIn PDF document text
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/4049761.pdfIn PDF document text
    • http://halfraire.xyz/14977332903ez8zy.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/36685a5bb.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/rewepalazamiso/the_interlopers_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/stoopid_sound_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/37941602258.pdfIn PDF document text
    • http://zijozuf.epizy.com/solve_quadratic_equations_by_factoring_ppt.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_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 5296 bytes
SHA-256: ba1a457895defba2512ef0adc8a30d51cc96a2df26a8a308d1406063ef00a22e
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 10884 bytes
SHA-256: b882b028da7ef410e5afce7d9431dfd1ed4a0b9160e481dd214fc12978f98522

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