Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6f56c0654694a7…

MALICIOUS

PDF

75.7 KB Created: 2021-04-04 21:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 42697cd45152a5643a50eb4b8874200d SHA-1: 671750d51c40bbd42a532c2ddba180592641c3f8 SHA-256: 4e6f56c0654694a741a13c3f9c3a97f19641e532c8b477a50a49f1ad15a78283
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/123?utm_term=vs+code+format+code PDF link annotation
    • http://bestcreditcheck.info/43137335880lfeag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_60513d52359f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483075/normal_5feccc451de8f.pdfIn PDF document text
    • http://virnet77.ru/power_pressure_cooker_xl_recipes_spare_ribs6ckxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_606132810ea10.pdfIn PDF document text
    • http://coupons2020.info/zaxok788ym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_604dcf0f1be84.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/jijisetq4v3d.pdfIn PDF document text
    • http://presalle.xyz/hp_officejet_pro_8600_scanner_not_working_macgnvft.pdfIn PDF document text
    • http://prizinsta.online/sashiko_tutorialpl46i.pdfIn PDF document text
    • http://ilkertr.shop/arsenic_and_old_lace_1944edwt6.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/00addd4c-626d-47e9-a69a-2f3333b5f449/how_to_write_an_adoption_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b831bd7-097e-4959-ba5c-e7175b0e3d20/53627724941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b306c9-1355-4337-9107-7db5d4fba41e/never_eat_lunch_alone_app.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_08a6a269b6aa48f0b409c2628283674e.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_b86a5965222f49a4bcda1284fb6a2025.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/121080df-29e3-494b-8dc7-5cc44e0437a5/80131341254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546afe65-a3d4-4414-8892-ea4a2d80e955/honeywell_vision_pro_8000_manual.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_aad652a302874a18b7109032a9bca768.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d62213-3a3a-40a2-97d1-e24a0e1c5b6b/wowwee_robosapien_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59a7ec7-88b7-4f30-a2ba-c1ef4a057cb6/46661228014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c5b2a4-7293-4943-a879-c239d52b5010/bafovale.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_5a7742bc65a24fdc82617c773ab4fc65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e98302f-a6fc-4578-88fc-07c35fa4b5c0/que_es_educacion_fisica_recreacion.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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 5100 bytes
SHA-256: e4ee76a950514ac3789833e053d935945d1820c2a558ba781c2d9390e55174f0
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 11272 bytes
SHA-256: 03a002781456d1c91ae186e09fcc3db46bf6f5a4974abb7c3f7b53560adf3438