Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3519263aad3032d…

MALICIOUS

PDF

89.4 KB Created: 2021-03-21 02:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d94e476cdd22c57b0d1be15780b56bae SHA-1: 7ff6b6679822c58fbcf6318d6d32e7f935470fae SHA-256: d3519263aad3032d0bcd9403de82e789cc2cefeaa6905e849b5b86356d3f2780
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://maypoin.ru/123?utm_term=technical+report+writing+template PDF link annotation
    • https://cdn.sqhk.co/xinovupu/Nlich91/86754493299.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/ruvobi.pdfIn PDF document text
    • https://cdn.sqhk.co/legifenobir/6EjaxMY/spielberg_meaning_in_urdu.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/jelovasemofa_puzeduwodad_dewuzesuxozupum.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/castle_on_a_hill_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/aOighde/82468587210.pdfIn PDF document text
    • https://pexerewiku.weebly.com/uploads/1/3/5/3/135313352/ea07e5.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/7zJpidf/amazon_assistant_app_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wukevivetarapu.myartsonline.com/mobile_catering_business_plan.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_1581b3ee13ae40e6816f611a7431b5b8.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_9c46948ccfff4638ab9aea0e00441b96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/964cc4e3-4b09-4272-bc53-100f8d88276b/berepixudokuzekibala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd81441-f382-44d3-a605-4022d0c7a165/how_long_to_cook_turkey_in_rotisserie.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_0fff69fc10dd4140b1c58615b2dee722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80dab382-117c-4538-99f0-b455dd8a32df/jezukarumow.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_09782cfe8f764d06925a0d760db46470.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_eeec5f851f564fd2bf36c47ceec3fc84.pdf?index=trueIn PDF document text
    • http://gegurobaz.myartsonline.com/xojivomor.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_089ba91d371b4d6e93178439ea7e7bd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e80b9d-45c7-444c-bda9-280c2eb31c87/kixebeberuraxufamiluposu.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_24ca59c1bc35452fa47dcc2519ab2e45.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_99bf036d41a94cff8485f84e622b33e4.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_8fb4d8931ee04a398a6de1fbd58baecf.pdf?index=trueIn PDF document text
    • http://roxujewov.myartsonline.com/passive_causative_exercises_with_answers.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_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 4996 bytes
SHA-256: 877afc2dc7e8044b251b512cd1a2a1ca3db64dbc2810306a17be9f316b8aa3dd
font_01_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 10504 bytes
SHA-256: 7867f7b146a730240ff69bfafddef4ee41032d199a8ef1db468fde1404aaca72
font_02_sfnt_off000149d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378