Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6c01fb33eae560…

MALICIOUS

PDF

88.7 KB Created: 2021-09-14 13:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d97ab8d05325d4c621130b4b7edacb41 SHA-1: 8918da567ab573da79e6969a92c1799467f2e97b SHA-256: 9c6c01fb33eae560dcab9e3aff582a89f7c7aecd32cb4f4c3a2a8d317ecca488
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is the redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://huntic.ru/uplcv?utm_term=pokemon+tower+defense+3+unblocked PDF link annotation
    • http://enidental.com/userfiles/file/20210907164443.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/6492106272.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/67548158175.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/ridinobowuta.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6e76c136a5f0f1bdd120b5a07caf94b4/guvukinosijijeses.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/fefivezokoxovewozeli.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/71913029496.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/48183553850.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/nixokovijija.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/gapute.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/59382537405.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/mojawopekurosunamon.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xipiwek.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/19757856769.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/fulosimuditedozapudejev.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/porinuxowisikefefoxesuke.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/witupabufurinajonosetu.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/jogepanitawugo.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/12465456860.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/80290160994.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/fuduz.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/94e9c5615f205d0a06eafe565ec3d053/19321873376.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210910132633_385078324.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/vogud.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/fufimisowosisami.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/52636030374.pdfIn PDF document text
    • http://teknis.it/userfiles/files/98838559259.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_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 18332 bytes
SHA-256: 9533bdb7475dcb617683e8598b2dac6cdc418bb49943c585a5d4318acfef1e74
font_02_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 10972 bytes
SHA-256: 6b4005f96f79709a46a1faa4775cf5990a5842cad16100ec48f1074983d545ee