Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd516f61e9235ac…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 19:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa35acadca6444918f2705587e17b75b SHA-1: de678400901cfe8dfb62c0cd3705d4d82589c977 SHA-256: 5cd516f61e9235ac413ec386a802b25d05abc7b77e46178cebdfbb84cd5faa88
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. One prominent URL, 'https://botokaw.ru/strik?utm_term=trane+compressor+cost', is flagged as suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=trane+compressor+cost
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ff45e9885e18.pdf
    • https://static.s123-cdn-static.com/uploads/4414175/normal_5fc5ce9f60999.pdf
    • https://cdn-cms.f-static.net/uploads/4487905/normal_5fe755aad6e36.pdf
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/7a3dbe74.pdf
    • https://juvujifakodokiw.weebly.com/uploads/1/3/4/6/134699996/8547843.pdf
    • https://cdn-cms.f-static.net/uploads/4422163/normal_60268dc1c2720.pdf
    • http://benilobodereji.mygamesonline.org/miopa_astigmatismo_e_hipermetropa.pdf
    • https://katinena.weebly.com/uploads/1/3/1/3/131383377/2787606.pdf
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5ff3a9217334d.pdf
    • http://fukuzowi.sportsontheweb.net/catecismo_oficial_de_la_iglesia_catolica.pdf
    • https://cdn-cms.f-static.net/uploads/4384821/normal_604b3ca7a7cb6.pdf
    • https://cdn-cms.f-static.net/uploads/4368495/normal_603c4f692172d.pdf
    • https://static.s123-cdn-static.com/uploads/4366337/normal_5fd084d3e1a26.pdf
    • https://cdn-cms.f-static.net/uploads/4417145/normal_60362bd4ee5d2.pdf
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5feef92120fa0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fogibi/the_anatomy_of_fascism_by_robert_paxton.pdf
    • https://s3.amazonaws.com/tuxexi/bodyboss_method_fitness_guide.pdf
    • https://s3.amazonaws.com/vufuzewasi/punctuation_worksheets_ks3.pdf
    • https://s3.amazonaws.com/fupanabivote/85716518674.pdf
    • https://s3.amazonaws.com/juzowilipi/95082720420.pdf
    • https://s3.amazonaws.com/daxemo/67864504777.pdf
    • https://s3.amazonaws.com/fowikorejodi/wetiwudarubifomo.pdf
    • https://s3.amazonaws.com/xulepiwa/pojadazofuperikaviresu.pdf
    • http://likasuretaw.onlinewebshop.net/mefuxitifekifafeduwos.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_off0000f300.bin
bcdf3ab0235db44d9a05c4c48a5c2ca3495bc07515ac4c284c22519bb57672d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 4996 bytes
font_01_sfnt_off000103e4.bin
28ee14749a75b1bf36f5528933021dba5be550c8a4fec318c0a8f10dc8282272
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 10624 bytes