Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf18829e6ba82df7…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 22:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6cf0965bec073137f89ab86cd12c4685 SHA-1: b3cf5ec26ab37b55e1ab106476974fc93f6886c0 SHA-256: bf18829e6ba82df7591898e1798f4ce7ab860a55cf4df4b19917ef809cc8198f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for phishing or malware distribution.

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://ponafet.ru/123?utm_term=minecraft+budapest+map PDF link annotation
    • https://cdn.sqhk.co/tatonabufule/WViaxif/jumotowovanupagivoped.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/ghIVUfg/mamepu.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/bookkeeping_all_in_one_for_dummies.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/bgiBVhh/jekuxodogenipebesa.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/gMbjaje/dynasty_warriors_9_gameplay_pc.pdfIn PDF document text
    • https://menedufigejit.weebly.com/uploads/1/3/1/4/131482930/4349367.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/lufosegifaweforona.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/6idZhfp/stern_pro_pinball_machine.pdfIn PDF document text
    • https://didoruzokikad.weebly.com/uploads/1/3/0/7/130739542/kosikowene_nezokusobenel_sorenomotox_pefidun.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/770792.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/Y1jaohi/download_az_screen_recorder_pro_no_root_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/ia8jcKr/89750614168.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/gitutot-rifowa.pdfIn PDF document text
    • https://cdn.sqhk.co/nivuduful/hdhcljj/d_r_m_ka_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/kilalovuge/tB2jije/applecare_lost_device.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/86fe56e5-cf65-40db-b327-f078254f530b/blender_3d_basics_beginners_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc66f85-5691-4a49-ac53-bc9ef5fa9134/65591290289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6942b432-b8e5-467c-b27d-1f50fdb56076/thetford_rv_toilet_bowl_cleaner.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/how_to_add_and_subtract_radicals_with_exponents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372e3ad6-7595-41fc-9ede-8040cf8359fa/tobipazajexafopogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7eb0c81-f058-4ab7-9524-74cd07e1b11d/grounding_techniques_for_anxiety_and_panic_attacks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6afb9f-131e-4d93-9bc8-bce2ef4b7204/39967335611.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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 5412 bytes
SHA-256: 88974b335896fa87f8f74a896acefd7528d188e00d63885f1d0507b3a2e2432f
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 11044 bytes
SHA-256: 9e1d8b44aa91697b6526eb1557eba516246a60fc238ba144e8fe8d83b6e34bee