Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc595a35b7a9f911…

MALICIOUS

PDF

78.2 KB Created: 2021-04-09 22:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 223a0deb2fe7ab7a3d619c7868a5848c SHA-1: 274c7240e3479618e17beed0121461c4541d5409 SHA-256: dc595a35b7a9f9115408b0925f87d01ff3db1c9cc1929a3b365fc5bd6e8b1b62
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content, likely a phishing attempt or a downloader for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=innova+3160g+code+reader PDF link annotation
    • http://sethel.xyz/prentice_hall_geometry_workbook_answer_keyk3v46.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/GoazZhd/airport_scanner_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5fd3238901373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_6057b751befa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fec932fbad43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_601d92f634678.pdfIn PDF document text
    • http://stroymarketmetal.ru/losuzenavarulevuwefimw8hy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_600aed0b8b6d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459326/normal_5fff31d32aea9.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/Kcifje5/lorisidajovejexuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_6039a62fc3e23.pdfIn PDF document text
    • http://raftgjgr.space/plantronics_voyager_5200_wireless_bluetooth_headset_chargerzg0o0.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/bjaMjgx/new_resident_evil_4_tricks.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/0f6afcad-0e39-4b7c-864c-aaa188cbe246/how_to_call_forward_on_avaya_6408d.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_e9002d571cf74730a3f33bbd1fc741a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d61d20-975c-4ce8-91f4-2396ed75c8b2/cancion_completa_del_toque_de_bandera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6f3b1c-ee1b-491f-8b90-f02c097a910d/hp_officejet_8600_drivers_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fd2c05-b3c0-4ae6-9571-efac6cd45827/nebiseju.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_93db1a0ce36f4715b113e4dd73732bff.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_a46887e334ce4672ad0576f51cb24ac2.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_c67793ecbeb9429487a09fa15b5584f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58767ea-72bd-4fe5-b1a1-0b2f92f47b36/92586697588.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_3612331e0f984725bdaa9162248cbac3.pdf?index=trueIn 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_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 5408 bytes
SHA-256: f6e67a7f13d0615c144658e99b02f5927b19f99f40ebc8457a24cbac94d46ee2
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 10800 bytes
SHA-256: bd725ee22ded64f925ccde7ba71b196c437a86fe5d8c006266ffe9dbb5850900