Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05f934d8c4b0dd4…

MALICIOUS

PDF

70.6 KB Created: 2021-04-03 00:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b994fbf779d6ace648a655a6d91c319a SHA-1: 54c3a1a79ba894cdef6ea118e499154c1d95ae5a SHA-256: c05f934d8c4b0dd468b1c24efd32ca1d366df52874a13862d5cf6c9660e8b0fa
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 0.9992

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://zajinet.ru/strik?utm_term=how+to+use+lancets+for+diabetes PDF link annotation
    • http://borejukeluteva.mygamesonline.org/zataxoridedanefesir.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/61657705293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fe8e4dd1bab6.pdfIn PDF document text
    • http://gafabotipunofu.mywebcommunity.org/gedewuroxevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460228/normal_6006afd9bba80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_6062ca25a2e44.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/histoire_du_royaume_betsileo.pdfIn PDF document text
    • http://wejesigozolireb.getenjoyment.net/fugadorinalilibulavufet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_9eae1e9c2d58448db149ad3514a47ba5.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_3b7cbfa7191d4c4a91638542af567bbd.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_ce572f8b1f9743eeb07937b7d8252844.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_b6c523fbd693491ab0f8138fc1a85447.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_4524dac8e2c94be18cac469f508ff5c5.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_a1fcdc9f58cc463888a071f18ed91edd.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_3fe9c5ed325944f0a5dc7dea1936118e.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_a284ec47544e4c5fb6ec12e23beb73ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c31a70-4703-4e2c-914f-11e51708ebcb/liboviji.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_4e2e14508808454a9330cffa4b6d5eaf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5aeaa71-97bb-471c-b512-a5c2ceb7ef39/nigakazidedud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09fa969f-abea-482d-984b-dae0ff6f63ad/21125846258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d74d230-d1ae-404d-a869-40c27fad8a4f/40847104051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30dc540f-92b0-41b2-9e1d-1a6e249cd956/music_and_movement_lesson_plan_for_infants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85218a1-8305-4b7d-bc3a-9caefc8b9264/workforce_2630_not_printing.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_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 5208 bytes
SHA-256: 389031f40aea2076c0ac54b1ea682e9cc12256a39b8af286b2403213988d9038
font_01_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 11068 bytes
SHA-256: 3b86427e1762a513f340d52f630af5db898d36e641723c11eda43c4f998a8b16