Malicious PDF — malware analysis report

Static analysis result for SHA-256 57955af79fe2c9df…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 02:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec70cae01351d1ed4cdfcf3d068f0c29 SHA-1: db2aca099694462eccb370a99b4c3d2154a2050f SHA-256: 57955af79fe2c9df3d7b1124154575b511470b99509508a5dd70eb83a4bc4c0b
214 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to redirector infrastructure, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=dell+precision+m4600+battery+life In PDF document text
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/ccf9ac06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_60490f1313e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457332/normal_600e8734aec55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372074/normal_5fefd7562c915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_603079f6e975a.pdfIn PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/2137603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fc7e8abd0485.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/36167836423.pdfIn PDF document text
    • http://megidexabaror.mywebcommunity.org/kiwoganazugabepesejamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/how_to_obtain_a_divorce_certificate_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42561f6f-489d-40a2-b6d5-31045d43e4b0/38898331266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8dd826f-aea5-4835-abcb-27fb2b30e638/microbiology_notes_for_bsc_part_1.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/sebaxupogamelob.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/91736857677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73ff3df-d08d-4d80-a7cf-b39ebb37c9dd/icici_bank_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/bellanca_scout_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80fc08b-b9a7-409c-93a9-b4434cea2fcd/62847796060.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/wipekiput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622e94d8-5872-4126-8b86-20edddc63f4f/miccus_home_rtx_2.0_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/9702445196.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/cfa_curriculum.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/gamufo.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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 5784 bytes
SHA-256: c46c871d0b18b318a06149f919ef029b28cbe207f79c52a2715d8105247ef4b9
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 11160 bytes
SHA-256: 3e46dd99bc7f5372ee4e620a917b1e588c6f7a8a8cb2104047c68c801489f3a8

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