Malicious PDF — malware analysis report

Static analysis result for SHA-256 4495bd52b9f19791…

MALICIOUS

PDF

89.1 KB Created: 2021-05-19 00:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c966a8d69867b41e9672d88dd44c2078 SHA-1: 2ca706803976d9d73de89f2f8a9a84ca59817008 SHA-256: 4495bd52b9f197916df4139f800fc701b309aefccf421698df24ad34b74de931
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('ponafet.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to generate traffic or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=the+story+of+us+boom+worksheet+answers
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/9195288.pdf
    • https://cdn-cms.f-static.net/uploads/4448744/normal_605905f3c89f8.pdf
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/1219175.pdf
    • https://cdn-cms.f-static.net/uploads/4465125/normal_605a6ad711495.pdf
    • https://cdn-cms.f-static.net/uploads/4487905/normal_60503c15d1a56.pdf
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/9c8ce4cd146.pdf
    • https://cdn-cms.f-static.net/uploads/4366340/normal_601f02c4e043c.pdf
    • https://pijagifodila.weebly.com/uploads/1/3/4/3/134308300/jabivusulapo-ziramaw.pdf
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5ff2e35d816d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tumasun/stanley_fatmax_700_charging_instructions.pdf
    • https://uploads.strikinglycdn.com/files/e1b25e49-fd2a-4ceb-b71b-c65ecef42da9/69670541011.pdf
    • https://s3.amazonaws.com/nufidibodudulad/how_do_i_watch_directv_on_my_ipad.pdf
    • https://s3.amazonaws.com/tofizo/ditinumejalobokuju.pdf
    • https://s3.amazonaws.com/gazitif/how_to_make_splat_hair_dye_pastel.pdf
    • https://uploads.strikinglycdn.com/files/9a86773f-1587-466e-8461-9172d3ffa813/xelewonagirakovefugorilew.pdf
    • https://s3.amazonaws.com/genukopapovixo/39725532733.pdf
    • https://uploads.strikinglycdn.com/files/8b1e7c17-9aa8-41ff-b1c3-cee2bc25a2ab/33642632237.pdf
    • https://s3.amazonaws.com/vukujidor/jawbone_big_jambox_bluetooth_not_working.pdf
    • https://s3.amazonaws.com/nuxomigo/gusuxosukarotemozaso.pdf
    • https://uploads.strikinglycdn.com/files/0800551c-cd06-48ad-a138-6bc66112c1eb/malegunitiju.pdf
    • https://uploads.strikinglycdn.com/files/ab05abaa-7cf3-41a9-9ea2-efe279f0c586/why_wont_my_rca_tablet_turn_on.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_off000108aa.bin
b87d0ee919e11e10bf35d7f9cddee5df9af5559633b7675313f38ee9d6c9446e
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 5324 bytes
font_01_sfnt_off00011ab1.bin
9fb24106d188bb34a3417da5eee8496787c13c98e26602e7a182dd5946882567
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 11492 bytes
font_02_sfnt_off00014211.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
pdf-font-stream PDF embedded font (sfnt) at offset 0x14211 16092 bytes