Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cc3cb0bc27ee5e…

MALICIOUS

PDF

81.2 KB Created: 2021-05-23 08:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 268a7c72e8ef15802c52fe40a0a95e51 SHA-1: 957c2d62a02828c201b73fc8b152f3106c725854 SHA-256: b9cc3cb0bc27ee5e346d853edf28e74619fe313d868c8a3d87e362ae47ed849e
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 as a 'PDF link farm' heuristic. The primary URL points to a domain associated with SEO manipulation or potentially hosting malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=summary+of+animal+farm+chapter+7-10
    • https://cdn-cms.f-static.net/uploads/4451929/normal_601b44afeb6bb.pdf
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/4625935273ec54.pdf
    • https://cdn-cms.f-static.net/uploads/4449422/normal_600e6956ee914.pdf
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/7117146.pdf
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/zonomuvimivasi_newiwebeta_palagavumapup.pdf
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/6317888.pdf
    • https://cdn-cms.f-static.net/uploads/4493545/normal_601de678138f4.pdf
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fc605ee99931.pdf
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5fdea2d1b7543.pdf
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5fe1b7a9ad4aa.pdf
    • https://mozalotajevel.weebly.com/uploads/1/3/2/6/132682758/bunokoli.pdf
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/908564.pdf
    • https://nurobajaxi.weebly.com/uploads/1/3/4/5/134507542/moxinagufebin.pdf
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/cc806.pdf
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/liwozojasipaw.pdf
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/terozob.pdf
    • https://static.s123-cdn-static.com/uploads/4405654/normal_5fc9400a31ec5.pdf
    • https://cdn-cms.f-static.net/uploads/4444885/normal_606495cc8e413.pdf
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/7ea45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ee80f8cc-522d-4f56-aaf1-245a49df86c2/calculo_integrales_definidas.pdf
    • https://uploads.strikinglycdn.com/files/52baa247-3d76-4261-a452-932767073627/how_to_know_what_hashtags_are_trending_on_instagram.pdf
    • https://uploads.strikinglycdn.com/files/c6df60a9-d034-434b-bd97-ea0abdf9a712/conexant_audio_driver_windows_10_free_download.pdf
    • https://uploads.strikinglycdn.com/files/c6275e0f-8656-45a6-953d-374a26eb755a/learn_korean_language_in_arabic_free_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100d4.bin
dfef48018de6913f68b69c5fef2594785efaea3fa7b9ef870454e69bac0fddda
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 5588 bytes
font_01_sfnt_off000113cc.bin
bca83e17a769ab131584ae9e18d263b3373c6d8bbdbbc969ea26f97bd99eeea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 10508 bytes