Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d83232ff36f349…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 20:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5be01161b523014f55293e57f193a13 SHA-1: 7c5ef240e9992017d9f16c347b28c8b8d0148e68 SHA-256: 85d83232ff36f34957291dc61002f7e0c5eb71eac53059c1eda9b9781bd089a8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a bursary, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://mezovuduw.ru/award?keyword=nedbank+bursary+2020+pdf PDF link annotation
    • http://govnososal.xyz/montenegroeditores._com._mx_4_gradoar0qj.pdfIn PDF document text
    • http://startask.ru/17578442533w2s3v.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/luriti.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/2515f3cdb.pdfIn PDF document text
    • http://arm-watch3.club/tigalirezuwurard7zxe.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/service_costs_for_jeep_grand_cherokee.pdfIn PDF document text
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/4833416.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/zosemem_dabava.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/cd73e021-9f62-40de-aa2b-a2268a7fc7c5/emoji_exit_ticket_template.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/63043818595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13cb72e-a285-4c9c-b626-a24f4db63d6f/how_to_get_rid_of_gas_with_yoga.pdfIn PDF document text
    • http://memamawu.onlinewebshop.net/99469523684.pdfIn PDF document text
    • http://josuxak.atwebpages.com/antibioticos_veterinaria.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/boruwuletuvevojotefa.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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 5552 bytes
SHA-256: bfa99ad1060f473e9c74daf812d13af37460c03ac1608da54588e723d1801c20
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 10900 bytes
SHA-256: a2bf9c62b2ec15584fd2140eb1553dedf3ed3a4a529c8f5c17796c3a9d623e66

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