Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2a429bb4be477f…

MALICIOUS

PDF

78.1 KB Created: 2021-06-08 16:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 003c5043a1857f040a2f99c7ced7af3e SHA-1: dd3f55e56ac613f2832a2c07243fe2f092155ea7 SHA-256: eb2a429bb4be477f67bae9cb882399bf6f8d6c6e5f06d4b68a936d9bc0d27fbb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content, likely involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/123?utm_term=buddy+toss+mod+apk PDF link annotation
    • https://kavoxeta.weebly.com/uploads/1/3/5/3/135323229/eb8b4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_6054051113283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_60524aae5e6c0.pdfIn PDF document text
    • https://nusosujorogu.weebly.com/uploads/1/3/4/5/134589145/2156275.pdfIn PDF document text
    • https://medekokimezud.weebly.com/uploads/1/3/4/7/134748457/5a3b9742e5267.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/rebux_bugera_goxuzukezinovi_pomobuxonenum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5ff89a2b9e756.pdfIn PDF document text
    • https://bivofeneduwid.weebly.com/uploads/1/3/1/1/131163561/jinekalotekonak-xokurixeruxodif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_60662bb670701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366408/normal_5fcef894b27bd.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/0a053c7c-b6cf-4889-95cc-f286b28fe736/melewafevawod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ba5769-2920-409e-8ecc-c014f5938fe7/81370707182.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/f/parivinewilomelakilawapam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb4dfa9-8443-44a1-9668-225bd360888d/93199966586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e31d83e-faff-4109-b861-0a5a09065fca/piwawifaniveku.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/gapozo.pdfIn PDF document text
    • http://goxeguj.pbworks.com/w/file/fetch/144575607/how_do_i_program_a_universal_rca_remote_control.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 5192 bytes
SHA-256: f8f4b820702affdadc6c9c1f1dac4eff07e9ea9502999192145976cb88fb377a
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10792 bytes
SHA-256: 07302434482bc18167d3d316a6238d9d84bc7a061041308136965c598483db7c
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16164 bytes
SHA-256: 4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06

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