Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fd8d81e8d3e841…

MALICIOUS

PDF

75.5 KB Created: 2021-01-05 19:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 37ed68c2891229a34b7b4781dd7834f9 SHA-1: 9dd23b293b9877da633ee45dbc707baeb5f3561e SHA-256: 54fd8d81e8d3e841a89a1e839f5928c45bc113b0090890f85a52f9f1cfe5a477
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The PDF document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect the user to malicious content. The primary malicious URL identified is trafffe.ru, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://trafffe.ru/aws?utm_term=copperplate%252F+english+roundhand+practice+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5f8cbe2e7542e.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/7295975.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/iiIifig/network_marketing_books_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/ja3cvUf/81733238513.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/pulavokaxe/dusavemukeretege.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/bogglesworld_grammar_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/www_biologycorner_com_worksheets_microscope_use._html.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/asian_paints_apex_ultima_book_of_colours.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/bibexakakirezopexifan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 5276 bytes
SHA-256: 439f4cb6a3ab1ccf7f1baeb605eebd7f0de0f280a88e20e2764fedcc7081781d
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 10420 bytes
SHA-256: 7b0c85c1bc4713bb520fbf129e1615f934e7327accd7233a371e8497f3afda3f
font_03_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 16448 bytes
SHA-256: ade9c6aecacb734cd9d73a434ee091b05a10331004103cdbee1a1a73bd7166d2

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