Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1be2b6fc6a13934…

MALICIOUS

PDF

94.4 KB Created: 2021-01-16 15:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5e861dfedcc2c62cea284dc25b801274 SHA-1: 720b100968530f258c12b94ab2dfbb09083c00c1 SHA-256: c1be2b6fc6a13934f60e70dc4f7c644885ebafb7843de353c8b8a19d972ad96d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'biological basis of behavior articles' and references 'wkhtmltopdf', suggesting a lure to disguise malicious links. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://traffmen.ru/123?utm_term=biological+basis+of+behavior+articles In PDF document text
    • https://site-1194807.mozfiles.com/files/1194807/punemovivo.pdfIn PDF document text
    • https://site-1172210.mozfiles.com/files/1172210/hair_fashion_salon_kirby.pdfIn PDF document text
    • https://site-1177444.mozfiles.com/files/1177444/25077778892.pdfIn PDF document text
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/jogaxubelirin.pdfIn PDF document text
    • https://site-1176587.mozfiles.com/files/1176587/94804748645.pdfIn PDF document text
    • https://site-1245107.mozfiles.com/files/1245107/92400189799.pdfIn PDF document text
    • https://site-1172122.mozfiles.com/files/1172122/nusuxoxovinitojubuxuwe.pdfIn PDF document text
    • https://site-1178426.mozfiles.com/files/1178426/tadejutuvugajifesel.pdfIn PDF document text
    • https://site-1177224.mozfiles.com/files/1177224/jukexofilafuzizijerifonu.pdfIn PDF document text
    • https://karoxenerom.weebly.com/uploads/1/3/0/7/130739074/9c1107.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/falufusu/gevaravademerif.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/65437741980.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_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 5392 bytes
SHA-256: fa2fbc27aa5561224fb4f1bee4aa5edd799872d1aa7182e1536646a646acbcf4
font_01_sfnt_off000146b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B2 10660 bytes
SHA-256: 9474231439f41684b49a1288bff39bbc41fe04830fba4554109e6684c6593a10

Open this report in the interactive analyzer, or submit your own file for analysis.