Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c87aa9d9fbf32d…

MALICIOUS

PDF

77.8 KB Created: 2021-05-20 02:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b4514e3ed4d4152f35f5660f9f8d8575 SHA-1: 8f3a07017cd843edda8e75889a3d7459bd7c65ea SHA-256: a2c87aa9d9fbf32d0793cd53be87599f08534d33c2cca006bb5a721f3934e970
186 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 hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=what+are+the+types+of+english+for+specific+purposes PDF link annotation
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/tiruwenijonafil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_6033deaf45804.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/70576.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/vefatefusiwoja_daseder_xilasumopude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_6018a60302478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_601bd457e2c72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fe52f5937400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5fe20953be69f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377697/normal_5ff11676cb1f8.pdfIn PDF document text
    • https://tejifogigevavep.weebly.com/uploads/1/3/4/6/134675995/falaxafirobiv.pdfIn PDF document text
    • https://ragidogatekanex.weebly.com/uploads/1/3/4/3/134388076/4d7dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_60589f858c47f.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/efbd7831-8a6e-4f8d-90aa-5a0adc50fa90/27907511555.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/58425457671.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/what_is_the_scent_of_sandalwood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a1b81d-d111-4f6c-997d-ae252d0081a3/final_fantasy_vii_guide_official.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/sqlite_cheat_sheet_injection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe564fac-2bc7-464f-ac87-ecd73a9bfed5/what_is_the_definition_of_exotic_species.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/mackie_1604_vlz3_vs_vlz4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9dae44-bd1d-4d9b-ad65-f3454ff0eff9/webelos_den_leader_guide_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/21474590610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71601849-4a6b-43cc-872f-e50ffc1e92b0/gatesakisuzezetofep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d465ed-d8cd-40ec-b8dd-b4a2f800a0a6/1640604522.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_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 5392 bytes
SHA-256: 5588c185cf9af4adc349f1c6fc69978d9c6354c049b4ec3795dbc9202002b227
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 10308 bytes
SHA-256: ee8b3b1c46d98f68fa7521a6e4c4907f14c98ba4bcf8a43bb7a95ea6aac0ec06