Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18d4868093e53cb…

MALICIOUS

PDF

72.2 KB Created: 2021-09-30 23:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d39dcef30f40547b2855268d97d2800 SHA-1: 317ca365287e95abf8e63bc9e2d37e1c0660acf8 SHA-256: a18d4868093e53cb0b389b977ce48e9411a7feb959a21802f0458956129f47e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a tactic to distribute or mask malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, likely for SEO poisoning or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://panel2conso.com/userfiles/file/11047723448.pdf In PDF document text
    • https://wsbtitan.com/images/file/98910898529.pdfIn PDF document text
    • http://cl-pub.com/files/files/vavirirogezadakipazajeloj.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/duminijijijesitenogujo.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/84199888627.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/79900572553.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/fotupefofetidawa.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/vafaxiferawovim.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/vesenuwexe.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/sasubep.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/210029324109.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/75643994418.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/jegibet.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/pagemenunuzav.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/63381051377.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/34018740148.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/67004395647.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/maravim.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/67906641666.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0140dc0d---8803654613.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/53003442573.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/19185943122.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/mixev.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/funusorosemawetimufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=utorrent+apk+for+windowsPDF link annotation
    • 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_off0000b497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 10632 bytes
SHA-256: 26f01438a8392cd9ec2a89aaecfde34e5b71c7cc4f8acc000f5f3103216a8a02
font_01_sfnt_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 17852 bytes
SHA-256: 26e092ffc9c995e55ff65e8e42d9212aa133a31636c1010815233bb6aa100454

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