Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9d0e009c43f687…

MALICIOUS

PDF

78.4 KB Created: 2021-05-19 08:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f62ab23b1d61f25965a8be5fa8852e66 SHA-1: 7daf0030a9280866421f1d7b675517ddb065a477 SHA-256: df9d0e009c43f687a2a115759ffd1b65e0c05e92276c717a4fa9d8258137a8eb
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure further supports a phishing or malware distribution scenario, likely involving exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=homelite+lr4400+generator+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378157/normal_6066a18c2111e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413969/normal_5fc78bd70cc58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5fdf923b042cc.pdfIn PDF document text
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/modalunegububo.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/6237386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_6063d1b94bd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_6037d3f221860.pdfIn PDF document text
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/diwijikodazo_noxixupa_gejisoxiwukawar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_6012cd970671d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fdc8a61578bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_6025a02963699.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/70de9a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456376/normal_5ff409d7200a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_6050cbdc3e416.pdfIn PDF document text
    • http://zudumawekal.22web.org/what_does_a_differential_pressure_sensor_do.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_6052d34f7014a.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/96f7fa18-2606-4460-a882-d30cb89efd02/domafiwujedoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2a0545-b867-4b87-a2d1-8a1afa407066/how_hard_is_it_to_learn_egyptian_arabic.pdfIn PDF document text
    • http://kinovogofidi.rf.gd/ludzie_bezdomni_greg.pdfIn PDF document text
    • http://midizigikeg.epizy.com/how_to_remove_architect.pdfIn PDF document text
    • http://notijopozij.epizy.com/adolescent_depression_rating_scale.pdfIn PDF document text
    • http://muvizedo.epizy.com/mokufopimerejoxid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264511f8-12f3-4c24-b8af-6d5d73bb6bb4/soniwugemejurebifovoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3974dd66-f62a-4075-a166-d1b2f8267dd9/51867986822.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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 5444 bytes
SHA-256: 8048913548d6bda8ecbab28166e1d031d72b0e86d170d00d613d06efc7826f66
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 10820 bytes
SHA-256: 3d02b531693c8cecda4e2166b58b49e769ecf0b313ad8d851ead7c5122c9c559

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