Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd27a1416f78168f…

MALICIOUS

PDF

70.7 KB Created: 2020-12-06 13:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cb3b49b8343383dcd5d864864968868a SHA-1: 17e7aad6bef010f9b3f2af34a23c388a6ca62adc SHA-256: bd27a1416f78168f87b3961ac3c434bf58f6553f2a8f169efb8b38400ce02787
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a link farm designed to manipulate search engine rankings. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://trafficel.ru/strik?utm_term=vault+guide+investment+banking+rankings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5fa61118607d4.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/8279077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488101/normal_5fa95b8de9ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_5fb2bd422cf81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5fc51c7e7a263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5fa0e8038c83f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473384/normal_5fadace986905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_5fbb21184112f.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/f7d21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4bcc5f03-73ab-404e-8bdf-40346ceb07e9/rugukulanut.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/56258298610.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/apiaceae_family.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b80e5bcb0228a28e2589/t/5fc4dc5ff81c9a2a0c3b1bfa/1606736992023/que_es_morfologia_linguistica.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 5148 bytes
SHA-256: ae2675381e7d1c0f9f1f830622e8ac606d9247792c867e6fd86807493a853ace
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10532 bytes
SHA-256: 36c97dc86a4cacd6bb5d8c007e26b75d291e4cfe9c17c27d07fac5d0b816904c
font_02_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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