Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ee420d29a34ac4…

MALICIOUS

PDF

71.7 KB Created: 2021-04-06 02:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20d321b786bd8b8926abc9de9688183c SHA-1: 7a987d2677b91194b13aa6cb0bf3f2be440349ce SHA-256: a6ee420d29a34ac4f781c5e3a3f55d75494a409b5c84459a1912f2c2689e8fd6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO poisoning or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit users by redirecting them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=temple+baptist+church+new+bern+nc+concerts
    • http://janipuwibir.mywebcommunity.org/73832522450.pdf
    • http://doxalasi.mywebcommunity.org/westminster_shorter_catechism_question_35.pdf
    • http://steelsho1.club/wexarurizc4yba.pdf
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/059a252.pdf
    • http://taher-tcac.com/maze_runner_trilogy_4k_reviewq45na.pdf
    • https://ninapivojejuru.weebly.com/uploads/1/3/0/7/130775346/xowudoneduju_ledunolew.pdf
    • https://gojaxuwawozupu.weebly.com/uploads/1/3/1/0/131070912/894c15f.pdf
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/sufuxaj_dekunuvisofob_sazovena_melaxokibovu.pdf
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/fe19e41233305e9.pdf
    • http://probkin34.xyz/cangilones_definicion9kfxm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7de208be-7dd0-4c61-9cd3-a02adb2a1e86/42391301591.pdf
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_b225fa4fce304895b867a00233ba9958.pdf?index=true
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_fb9b13e9323a454f883a01a85ac85fe7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce939b55-4ab9-4f71-bc37-0ecbaa9933d1/lozunufererazeladasodepu.pdf
    • http://jeximojela.myartsonline.com/62371805369.pdf
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_7e823c6641e44bfa80fa0e47f992b48f.pdf?index=true
    • https://s3.amazonaws.com/kozewuposoridil/ctonurie_sans_glycosurie.pdf
    • https://s3.amazonaws.com/wenobagupexekap/bela_bartok_mikrokosmos_vol_6.pdf
    • https://uploads.strikinglycdn.com/files/fd2eb185-09f0-479f-b111-5c2ed1010e60/19635461279.pdf
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_1e53a1c66a0f493ab5415a618e54e8ae.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83c.bin
f0393a43a8ad95ed646d550b0ceb449ab898ff2f0e4b40032a2af3486d958740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 5356 bytes
font_01_sfnt_off0000ea4b.bin
7b0568a4e0f905e62f64136402e4b84a9de39c45d5ca1cccc8a8b14e6785a30d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 10976 bytes

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