Malicious PDF — malware analysis report

Static analysis result for SHA-256 905169d26c4c1968…

MALICIOUS

PDF

74.4 KB Created: 2020-11-20 16:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ef4b13852bf468f039eb1311253a19c SHA-1: 7cbb81e89c6086853e378ba81e5f9271a5f62d0b SHA-256: 905169d26c4c19687ce6bc2cbdc893544b945fc0da4940390a8615724a7d3b46
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially garbled, suggests a lure related to 'Adp paycheck information'. The presence of many external PDF links, including one to a benign-looking PDF on AWS, indicates a potential link farm or redirection strategy to distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

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
  • 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://gettraff.ru/aws?utm_term=adp+paycheck+information In PDF document text
    • https://seborokib.weebly.com/uploads/1/3/4/0/134096410/lepedoxiwurimileroj.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/9387501.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/zarelusipofox/manual_de_economia_politica_iturrioz.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/sekudozowitasiduxaze.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/bulumiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e44f269-50ca-4796-a38c-0dacddfe98f1/suvizosafalosovezeturor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30a2c21-8fac-4692-b5bc-08f9274557fa/96345673054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0a8092-8d7f-4f92-a099-c78abdf79cca/41788419065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38e1d5a-a8d9-44db-88ba-9e883c707eab/20853265045.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/jubevizaket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24289d2-c538-4c25-8ce0-a21e1dff32ad/bimiberumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339801f5-a024-4994-8d49-b2c4ae6014de/fabofizu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 5340 bytes
SHA-256: 01bf81a65941a25b49a83cae60b13cf1f5b69690844d62037ea528b409468687
font_01_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 10704 bytes
SHA-256: ade2159333ad0373e35807869c4015dc9d22e34625a2a8de619e323df27b7548
font_02_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 17228 bytes
SHA-256: 700fbc245a5bf9e658cf5e605d52e491010c971a58bf6ceb6e427d2040fba36a

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