Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf0b1685bbba283…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 07:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62957000e0d1198067a0d59f83c3557e SHA-1: ff5512d0a13305fe2e5548a1db248b031613d4c5 SHA-256: daf0b1685bbba283b6e81b58905ce22956947565d6612f16651013bd70f02f1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one pointing to 'smidgel.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=harry+potter+and+the+sorcerer%27s+stone+streaming+on PDF link annotation
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gasuxojezodutabilokiw.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/marukuserubafegax.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/56904447167.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/21088749476.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/xivegifobaragivata.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210907_429A0B3DAA47D542.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/91178024324.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/wowikujitajogisikob.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/97737209494.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631831075.pdfIn PDF document text
    • http://findusafranchise.com/files/files/mirasimev.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/75601835584.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/25406724732.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/62465230282.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/34956764780.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/22730845713.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/woretolinamim.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/mezavamezutuvawopetuwu.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/lerepino.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb1e0bf6f---pusedifedago.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/4427255390.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/newilerewibe.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/vidabagulajufat.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/mejakomokakikulenu.pdfIn PDF document text
    • http://mamitobe.ru/files/file/30028635236.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_off0000be01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE01 11052 bytes
SHA-256: 2648df178a7afd0cdfe905210b78a4ca5fe6223bf37a50e679a66f743f19b96a
font_01_sfnt_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 17624 bytes
SHA-256: 5c814ffa25b8e1bd305ee2d5877bb9d72e78cc101895fe6642b3bf8185ae205d
font_02_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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