Malicious PDF — malware analysis report

Static analysis result for SHA-256 f717ab7932e34fbe…

MALICIOUS

PDF

81.9 KB Created: 2021-03-31 15:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4b02a5f9781d068e0b53b97af150c9dd SHA-1: b4a2a86b521c6fdd4e9acc6baeb88fd96e87c1dd SHA-256: f717ab7932e34fbe0ef1fade3676023d7b48b7a3762fa766e44664ba0c84fbc7
186 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://bologen.ru/123?utm_term=credit+information+report+as+per+rbi+format`. The document's content and structure suggest it's designed to deceive users into clicking these links, likely for phishing or SEO spam purposes. No scripts were extracted, but the PDF's nature as a link farm points to T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=credit+information+report+as+per+rbi+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484636/normal_604657dbdf795.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/75309644544oomgd.pdfIn PDF document text
    • https://namoturobiro.weebly.com/uploads/1/3/0/7/130739164/3cfcc679c48b1.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/balancing_chemical_equations_answers.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/acromegaly_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411919/normal_5ffc81c8160c8.pdfIn PDF document text
    • http://euromarket.pro/vovifejonasunetum3swzt.pdfIn PDF document text
    • https://pojajowose.weebly.com/uploads/1/3/0/8/130813819/zudigodulededawope.pdfIn PDF document text
    • http://seplafond.xyz/barratt_impulsiveness_scale_questionnaire80mcc.pdfIn PDF document text
    • http://wacc-cat.org/4937866935hcay8.pdfIn PDF document text
    • https://sadijamozu.weebly.com/uploads/1/3/0/8/130814559/kizojumobixubit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_6010b4005cd8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/15c6e903-b51e-46a6-a1ee-5c1abf94e8c6/jamufosadefuru.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_cd99081daa6246cdaf9bdb2b56124c8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9cff76-4ecf-44dd-b64f-879483b2d7bd/free_willy_whale_call.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b46378-42d8-4b42-bc5a-c5dafb4a7f99/the_crucible_act_1_analysis_activity.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_76eeffce67044158bcb507cfa69086af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f57c9a-18da-4def-8d9d-6da3f0a8ebe4/feelings_wheel_printable.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/berrendo_catalogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/accff9e7-8c26-430f-a0af-e257ceb8d4f3/94444239541.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_139acef303f542cebd7f51b8a1270791.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 5108 bytes
SHA-256: 87716f2404c588b26c8073b9fdb8cf8e05306e5626648cc19fd8bff5f9ecef2d
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 11204 bytes
SHA-256: e5945b0735b62b281e7518103c4f44890c98da3059f707cc0a7351b247c947bf
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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