Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00fea912266a117…

MALICIOUS

PDF

90.1 KB Created: 2020-12-07 15:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8e841b3938f780d990a54eaccce0bfdb SHA-1: 1e82ff00937b435cca9fddeec1e2d963b09c4e80 SHA-256: e00fea912266a117fdd37ffd6aa51d6f45b326d31afd9da09c6d8413249a83bf
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the embedded URLs is 'https://trafffi.ru/123?utm_term=toastmaster+of+the+day+sample+script'. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=toastmaster+of+the+day+sample+script PDF link annotation
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/6934646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcd389048cdd.pdfIn PDF document text
    • https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/d38c1d6313ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_5fbed123d9757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_5fab38471f272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_5f9d9b2075196.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/kepevipawit/tifabokabapug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85db551d-cd3f-4811-98f6-dcefea87b70b/asus_transformer_3_pro_t303ua_2-in-1_hybrid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f79c1e6-6689-4188-b2ca-82149ca8e535/56203086085.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/zanarkand_theme_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/appendicitis_guidelines_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/bruges_street_map.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_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 5444 bytes
SHA-256: fef85ba5d405465b34ffc2fd7c8fe74a823a33a602abaea16a939bfc095581f1
font_01_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 10944 bytes
SHA-256: a1435016b00b52465e7d3276f9edca63d70432f506918a25bdfb7d22b41f1a7e

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