Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d3f307af71a6f1…

MALICIOUS

PDF

73.6 KB Created: 2021-05-01 12:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d9ac32d301c16e3a160680e8543ae8c6 SHA-1: d4f9aa5574d12797026609cbf8e5e020c60bbc79 SHA-256: c9d3f307af71a6f1ec2aef7d8b3206d6d095476fe782fb5506ee04fca80d3ea7
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The primary external URI, 'https://ponafet.ru/strik?utm_term=char+broil+propane+smoker+parts', indicates a potential phishing or malicious redirection attempt disguised as search results. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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=char+broil+propane+smoker+parts PDF link annotation
    • https://cdn.sqhk.co/sifalavuxozo/nlTXdjf/78154544757.pdfIn PDF document text
    • https://pivifezimar.weebly.com/uploads/1/3/4/7/134719334/5086149.pdfIn PDF document text
    • https://jerijumewatopod.weebly.com/uploads/1/3/5/3/135330781/5108910.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/hg9VjbM/android_activity_transition_xml.pdfIn PDF document text
    • https://cdn.sqhk.co/dazulegug/gjuifii/vox_cinema_uae_dubai.pdfIn PDF document text
    • https://xitagagumirowe.weebly.com/uploads/1/3/4/3/134346856/222dcb445607.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/ieJgehE/55009408513.pdfIn PDF document text
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/ganane-berogutigopoku.pdfIn PDF document text
    • https://cdn.sqhk.co/kukilapi/bjdjbhb/buvomomaxipuzaxaxomitemi.pdfIn PDF document text
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/tewikaxode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69381f5f-54bf-4908-b7b3-91991beba180/rezaze.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/bass_guitar_for_dummies_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f3d898-babb-4849-9379-b043aa0c093c/hp_officejet_pro_8600_teardown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffc6526-d5c3-46a8-b58f-9b2fe2a6d54b/wakamowigaxinepa.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/8700003370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbeda84-9ef9-46b0-81e2-cab258be2f4b/houston_texas_zip_code_coronavirus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3ebdc8-1915-49f2-b97a-0d694f907a3c/defefajuxemosepafu.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/54247455521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aefefc3-cb4d-4203-bd44-c11c10a548e5/23413485246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869c07a1-9eab-4786-b523-2ef4e1616062/what_is_support_code_b200_on_canon_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/3000696086.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/the_lion_king_broadway_full_show.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/41793909001.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 5168 bytes
SHA-256: 20915782432da1af10edbc640dd9febf2e907a8138c243159e06efe30ef6dd26
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10552 bytes
SHA-256: d66edb6ec37089d847faf7fcf6069c84380553672e629b3bf6bcebae420c4518