Malicious PDF — malware analysis report

Static analysis result for SHA-256 54668323e399e900…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 18:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: c022752975478f7bef43d4185e806991 SHA-1: 0723eac7fed3efb5d84162207a75e422951e5256 SHA-256: 54668323e399e90054d454a5ba2c14950407a7d5085a5cf8fb2ed726b0bc3110
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cytairtool.com/test/userfiles/file/20210903_cadb0.pdf In PDF document text
    • http://candientushinko.com/images/file/37193074417.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/64566201540.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vivogagagigolezokumeke.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/51276029064.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/1905020154.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/torumufexe.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210908_193551.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/89055426072.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dopenipefajevotak.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/xorovakepevokaguvevodewif.pdfIn PDF document text
    • http://www.520amis.com/upload/files/jifasuxajojirolovitifori.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/rezewoboxu.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109080302336956.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/gunevekipojevaxef.pdfIn PDF document text
    • http://zatacorp.com/upload/files/34687496696.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/88412222659.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/tinamugeliri.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/57504064062.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/22563291152.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630897895.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/boxumovibutewigesux.pdfIn PDF document text
    • http://podushka.by/files/files/13520094666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=judith+lorber+paradoxes+of+gender+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 11112 bytes
SHA-256: ff6ec3d345fdf779e53a2aea56b874b525fdb44d0ddec86ff3e25cf2cccdf2b6
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 18012 bytes
SHA-256: fc39c32a25918d19a15326f73e1cc2de5287985326726a1334338e85a40f0b33

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