Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef792bb4ee24256…

MALICIOUS

PDF

78.5 KB Created: 2021-03-13 17:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 46c189455bca6e80c29ef465fd4e5528 SHA-1: ddc5790f510846b0e53e50145f3779e6f87c9a70 SHA-256: 1ef792bb4ee2425610f349d43ae52b3896cbb2e1fc63b34091d0cd473e158ab1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=how+to+remove+kitchenaid+beater PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478378/normal_5fe32f2579b7c.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/3216235.pdfIn PDF document text
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/petipunawugawam_janopapa_vitukuwa.pdfIn PDF document text
    • https://mowozawufela.weebly.com/uploads/1/3/4/2/134234907/pazunu-xabexekir-rogizipinajada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_602551f4b5a03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_604ad595a97e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_604b57983f0da.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/da52b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_515d81a2c24b4446912dd44e4e93f4fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/rorizifuwilagotezifaxoxo.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_e0d416cf33164ce9975e5d6fefc43de5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxexi/bootstrap_3_form_builder_online.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_d7e1fd2513e2494699c7fd82e500045f.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_d8e248f573504106b7a64973a3af9abe.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_3bfe02597e5f4d1a97081c4f9286212d.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_a67a1973e40e458ba008212931692429.pdf?index=trueIn PDF document text
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_5d04a086d9134a6ebe69a551d60c3468.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_23e62fa9e6d241c9a2dce1ee5dda0478.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/what_are_the_five_types_of_mining.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/letedinem.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_7344a4a124f044e9bee8237d117ca198.pdf?index=trueIn 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_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 5288 bytes
SHA-256: 4bda298167536bad4dfd47b551d2a2db9af7bc36da19117ea1a709f1e4423dcd
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 12200 bytes
SHA-256: ffe906a93b76f2254cd5124ac59d958e9895f1f2508db3c7a3669ebb77c2be01