Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7739e9372c6df5c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 11:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c7d83f5e986dcc0a045efe47601852f3 SHA-1: dda8388c8194f301a3e3c40c98f6cc9ec011a8cd SHA-256: f7739e9372c6df5c9aae22426e40b0da18980f7b669071a1429d82a1bd1420f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The PDF's structure and embedded URIs indicate it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=batch+file+to+print+all+pdf+files+in+a+folder PDF link annotation
    • http://www.kevimotor-rock.hu/files/files/lavosave.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351fa9cecb0---86240414845.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/xagiropatake.pdfIn PDF document text
    • https://qkon.ca/images/file/53376278865.pdfIn PDF document text
    • http://kustari.net/userfiles/file/vedoxazinutov.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/223125252.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/gozofejijilaxujex.pdfIn PDF document text
    • http://ewtch.com/upload/files/42615555086.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/rofolepetunonovezefojipi.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/29965215518.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/89610798487.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/zejaw.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/jugipo.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/fabedijitopagalilosa.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/23314146201.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/19884399993.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/7164996423.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210916163539.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/95922214559.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161416f8cd451e---dotakugamuzesuja.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/72074363667.pdfIn PDF document text
    • http://cudicio.it/images/file/diginugowenizilokomu.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/mipefopinozisiresedugomi.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/puvifodimifopig.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/70012719744.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/96067050136.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://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_off0000b3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC09 16216 bytes
SHA-256: a7ac94ef92bb136b4dc322f0d91d615ab9e47e635ca2c510608ce8f881988213
font_02_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 10768 bytes
SHA-256: 29c389daa2c38f131b49533754c9489002511b60c26bcfd5cd1ebe0e188f3639

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