Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16116657c816b85…

MALICIOUS

PDF

76.6 KB Created: 2021-04-29 13:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 39614e05f8eda06ec64c5e2e2b022e90 SHA-1: e41be94b711e738d229340905ba2796f44820f25 SHA-256: b16116657c816b85a9435e045e4c20bd594ec9eeea0463f558b92b8a0bd1572d
166 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'Password-protected archive lure' heuristic further support the conclusion that this document is designed to trick users into navigating to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fokemale.ru/strik?utm_term=logitech+g710%252B+spare+keys PDF link annotation
    • http://vienvozvrat.site/electrical_and_electronics_engineering_handbookiomm5.pdfIn PDF document text
    • http://shishkin-seed.xyz/the_maker_eye_meaning_in_tamilt2drf.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/67950925567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447084/normal_60004980938ba.pdfIn PDF document text
    • http://bred-enligne.com/mopojapoterusofere1ix2h.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/faximili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_602460f1e3553.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/81860061488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_5fdc475d27181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_600cec3426b04.pdfIn PDF document text
    • http://policyhelpcenter.com/shark_navigator_swivel_instruction_manual27rlx.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/fadasaralan.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/mamawejobipexiwed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_605958b8c6b04.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/samsung_wa48h7400aw_a2_parts_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pujirageg/senseless_answer_means.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/18010948298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bc7c9c-edc6-4863-ac79-405eaa14c026/xevixupakexet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50acc87b-c0f7-44cf-92a2-27bd4f089fe3/what_is_methodology_in_project_management.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/savivomekilunosejuzir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf216995-9a26-49c3-be58-92e48e314113/5336558582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967a8511-5b3f-4cd6-8295-5b54c6562c7d/4962221680.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/pawufatezupikodilepifex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18479c7c-5a21-4eff-b39c-aeca48fe88a9/survival_knife_kits_cheap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 2900 bytes
SHA-256: 7b4a49995b7dd69d4afe5ee3eee77951727d25d484e62cc4016f8f5b91e0b297
font_01_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 5544 bytes
SHA-256: 5a6909e7e8194ec11e0540a8014cb0af7fb614d655efdde627df9bb634eaa6ff
font_02_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 11604 bytes
SHA-256: bdcbfd5d9b4264268b84f2b9314f885db3c966f7630aa962b37100d04fb0ce17