Malicious PDF — malware analysis report

Static analysis result for SHA-256 6552b686d5edffb1…

MALICIOUS

PDF

74.8 KB Created: 2021-06-07 07:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dce5505a5e97ec7f90ae09ed3b535626 SHA-1: e31f01f9b187406c0b3d2cdac46fcbe83fb7b6b6 SHA-256: 6552b686d5edffb152bbc191e815e3fef3eedc97fd7de54e2b9464b7dfb7dc9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9989

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.
  • 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://allytemp.ru/pbw?utm_term=intermediate+1st+year+maths+1b+textbook+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365636/normal_602b0690b3641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489599/normal_5fc9a2af9bc6b.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/2404462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_6022919494e97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_5fd8ad600d76c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_601708860c761.pdfIn PDF document text
    • https://xusezazidajitov.weebly.com/uploads/1/3/5/3/135325201/todusatomaxezod_rerutorak_webef.pdfIn PDF document text
    • https://miteviwu.weebly.com/uploads/1/3/6/0/136006965/luzise_niwaduriz_kubowig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_5fd73688853e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_60bd3935c1d01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5ff40f579a423.pdfIn PDF document text
    • https://kigazapaxulet.weebly.com/uploads/1/3/0/7/130774964/6e1ff2d616a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_600004b565621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58ab0f1-379a-439c-b2f9-f0cf0501223c/40893721670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0060b835-97de-486d-a5b5-8af60e4da355/nenenolizato.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144605406/30553728714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be875e98-56b7-4fb7-ba52-6ca7fcb8a811/download_minecraft_java_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244e2b91-3fe3-4b08-871a-137c6d607993/how_to_record_accrued_interest_revenue.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/laws_of_motion_questions_and_answers_class_11.pdfIn PDF document text
    • http://tujezowosop.pbworks.com/f/dungeons_and_dragons_5th_edition_monster_manual_free_download.pdfIn PDF document text
    • http://gexufak.pbworks.com/f/sifamagotirigekezok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6976866-5a93-4f9c-99e6-f3b1bcb8721a/kukudipavizazexivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde6b7bb-94a2-46fa-942c-3a2234498891/does_google_drive_support_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72aadd0-de32-494e-9667-05691a9d06ad/south_america_big_river_name.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 5736 bytes
SHA-256: 7b6924dad601fe634ab293ce3eb69908b2ea4999ac835bdd17f064496c4d2f64
font_01_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 4208 bytes
SHA-256: ecdbc0d9eed68debda189a09ba7057e989ad1cfad84ff3abdcd9bd0ba16ee6fa
font_02_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10272 bytes
SHA-256: e082f94665fec8df4fcc9919f8b199a1036b7b4e0c673397e8d3071b7c44a6aa