Malicious PDF — malware analysis report

Static analysis result for SHA-256 d599f5b538b1e1aa…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 01:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7639e6fff6f8a2576278686f67428709 SHA-1: 74a1b5942c1a1f09e98009e784077ec50eaa39c7 SHA-256: d599f5b538b1e1aa09bccdd5b1ab11394734a7620a1dd359658514dc0ed5fbe5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme, with the sample acting as a lure for a car information app download. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=car+info+app+download+for+android PDF link annotation
    • https://epagneuls-bretons.fr/caningest/images/file/25330363689.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/valumefepavidagalo.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/29268646901.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/1vincdq5ue5482lj2h8dbdtm8j/zafetepokajam.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/jojudadudogin.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/79078250306.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/75962941765.pdfIn PDF document text
    • http://www.og2c.com/images/file/dikomixeronob.pdfIn PDF document text
    • https://webmenuplus.com/images/file/20764129989.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/vuruledijamazodexevovene.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/rumovomibenubu.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/68135548935.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/gugutu.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/54662647574.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/21/file/jakegemurek.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/53995313064.pdfIn PDF document text
    • http://homeopathyhk.com/files/49732046005.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/dufasetakebamixipojino.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/66315730994.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090402011073499.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c49d905d7---xafoxidaxujabowaxu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/vosodorekawab.pdfIn PDF document text
    • https://teamcode.net/upload/files/24247832333.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/81680663548.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_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 17532 bytes
SHA-256: 8fe88b52552ddc2dd74ece1dcabcbbc0a95ffcf7d788254868525df4461ea187
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10208 bytes
SHA-256: 04c2a70eccab2853ae7ab9b97d5b21480daf2d17c67a99c8115fff72e31170bf

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