Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1067a51b644c46e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 22:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9ba2c888e80621932952933b42e2b636 SHA-1: e04453a58f2248caadb560802dea3d9118d68c29 SHA-256: a1067a51b644c46e5ebd863633cd74770b8129faff31d6adb7a4ad5d980bf6ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 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://infrive.ru/uplcv?utm_term=mega+android+apk PDF link annotation
    • http://powerfalcon.net/uppic/files/86369025219.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cs2ul7jl9hect6ta4kd78clj06/guroki.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-26/20210926030258513731.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/83138431253.pdfIn PDF document text
    • https://deepex.hu/hirek/files/rukokibipobotixamu.pdfIn PDF document text
    • http://eva.am/files/f9c7540623556844.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/kebiselimofaperibotepov.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/lewilupojolatenakabes.pdfIn PDF document text
    • http://poorclarescork.ie/images/bejitojirozodoruxaduz.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/wiberetavaxokaf.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/gavifo.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/31660502656.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/boledepujid.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/21390242232.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/vabevasukoruvakewekafebi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/41339869497.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/26942708471.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5stmnf62uitk17h9hdh96dm2t9/59245450313.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/84502694456.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/zasanubisiregajakamajipa.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wifapabakozipalolis.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/37477144416.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_off0000b379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB90 10340 bytes
SHA-256: f6edd2189f23c7e86e7bf0ef5b9d5516715b12eaea4752743c18134a80133dae
font_02_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 18396 bytes
SHA-256: 493276b868a7e5cf9dde4efba75925966bf7a3dbb38405c774a151e3cf347eec

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