Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f18b4197fef1d0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 10:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4978d83dfdac62c3ba9d023a21b1bb31 SHA-1: 865548935d23ff576312cb11db632db16bff704e SHA-256: 05f18b4197fef1d03b067d3a37d57dcbc5a0a9e871647ee0c2535b7fcdc0cd29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=pubg+mobile+lite+new+update+download+apk PDF link annotation
    • https://magnanerie-cazilhac.com/userfiles/file/85303302360.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/selosober.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/24199757289.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/38794071424.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/luzomudikemo.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/nuwukevorusi.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/11760182923.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/maduranexowuni.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/59827992147.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/fusubudopi.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/68358254670.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/xufegoxipunaf.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/68896969394.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/28465134859.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/bakeliponogobafetilanub.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/17278989438.pdfIn PDF document text
    • http://baoveantam.org/upload/files/ruzibasisatamujunedonef.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/88543149072.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613145badd557---patifuwutija.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/solevudibefenus.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/siwufinufaxazeme.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/18409920856.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/65525902979.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_off0000af9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 15056 bytes
SHA-256: 2422d035838af4beb894ccfcefe130f3a73fbc133bf3e9e6ba212296514e472c
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 10888 bytes
SHA-256: 110c2a36571a41bebfe43e27ba0ab77c60d44465ead484c8c581aafe16ee6957