Malicious PDF — malware analysis report

Static analysis result for SHA-256 d481631abdc29095…

MALICIOUS

PDF

87.2 KB Created: 2021-01-01 06:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ceb40f3b31ac4f36aacc290053caa1b SHA-1: 1b4012223859ee1b8cf6d807d6d5acb31fcb3007 SHA-256: d481631abdc29095358dacf8ad36ab11440bbcb01d2e2aebce780c051bbc0580
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which are hosted on disposable domains and point to redirectors, indicating a link farm. This is strongly suggestive of a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=palabras+de+cholos
    • https://peletawipimo.weebly.com/uploads/1/3/4/4/134444154/bfec886e.pdf
    • https://cdn.sqhk.co/xedufoga/fyQjfZX/wwe_battlegrounds_roster_post_launch.pdf
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/bilokaxotedawarejepi.pdf
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/4598010.pdf
    • https://lifufokawalujiw.weebly.com/uploads/1/3/4/6/134687559/birolozelepawuwabes.pdf
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/4019984.pdf
    • https://bexokibuki.weebly.com/uploads/1/3/2/3/132302940/8599755.pdf
    • https://dumejolizaxoko.weebly.com/uploads/1/3/0/8/130814858/gorosuxalu.pdf
    • https://cdn.sqhk.co/purovufizu/RUtltIh/bomubojipesu.pdf
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/5085705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5199ee21-6be4-4978-9dab-35a29e3e0d23/37708592324.pdf
    • https://uploads.strikinglycdn.com/files/0d54db28-67ee-4308-9caf-79135d81f9f6/nakovozikivejimed.pdf
    • https://uploads.strikinglycdn.com/files/e3117cae-8d4b-409c-9549-0a55eb4044f6/vamimizi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010076.bin
b0465c826979212a645fc9da048c236ad3227e31b2c933ae0bfcbc6bfe2d71f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 5168 bytes
font_01_sfnt_off000111f5.bin
266c5445e72b1f3fa98d44034f11d2c88e4343ee2fd6c06889005d74403f2cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 12372 bytes
font_02_sfnt_off00013a54.bin
ce3dc1767edaeda99fbc7779aa16f82ee6481ab9d5516a0d1ad3c5496b4c917d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A54 16200 bytes

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