Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2af7028abe0294b…

MALICIOUS

PDF

76.3 KB Created: 2021-06-08 16:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3698236afff3b173d480481adfd857f3 SHA-1: 010fb41d60af47a92094dd857f6836bd6fe96d6c SHA-256: a2af7028abe0294b01524c618af30036236a6c8bf3a747b5c56eb92f784629c4
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 0.9993

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://ketchas.ru/pbw?utm_term=total+drama+island+oc+fanfiction+%253B+50+%253B++%253B++%253B+Low+%253B+0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476925/normal_60bef6caeba7c.pdfIn PDF document text
    • https://tosufiriro.weebly.com/uploads/1/3/4/4/134472590/e10579b85d37d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_602f49119ed69.pdfIn PDF document text
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/dinuwajuvavuguz_tijudizijixozor_kodeferubatini.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485172/normal_60b683e9d478e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_605430a66d339.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/610640.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/fe0e8235-d38c-4dbe-8311-e9896b5594e9/need_for_speed_underground_3_gameplay_pc_requirements.pdfIn PDF document text
    • http://medodadepud.pbworks.com/w/file/fetch/144769791/how_to_recover_deleted_messages_from_oppo_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f217cc-97a1-434a-8f40-2a5bfded742c/is_the_mortal_instruments_movie_on_amazon_prime.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144867246/gopapomoforevuso.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144611280/cell_organelles_mcqs_with_answers.pdfIn PDF document text
    • http://vibuvedatixi.pbworks.com/f/witimesukemimerabenezud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5430779d-ad5b-4c43-8d03-ae3f011fabcd/9866897506.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144581607/how_to_get_cc_on_sims_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1c3004-703d-4d76-9393-cf0c190b04c8/kewewefazabomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f9f067-b92d-4ecb-987f-a96753201191/51438650648.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144711420/what_is_the_moral_of_the_story_rumpelstiltskin.pdfIn PDF document text
    • http://supulilofib.pbworks.com/f/style_lessons_in_clarity_and_grace_exercise_3.4_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58c081a-a983-4c4d-bae5-9f3ff06154d4/11076101921.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/f/sholawat_opick_full_album_mp3.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144641724/39445185613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6e26d3-cb8e-4096-88a5-788e21fdd464/how_to_tie_dye_kits.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_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 5580 bytes
SHA-256: 08693b0133534fb9576fc9885c578ef53614caf2c2252e5c8cc187804561107a
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 10264 bytes
SHA-256: 1be58fc32c2d2cf068f2ef4d1fea4842fce5dab41322ad0af9e8b10a346a5007