Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96b0cbfd2db2e91…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 17:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13607a49d216458cf39cb88fa918db85 SHA-1: ae36eed1dec03901627ce84c3804986339c1f7a9 SHA-256: a96b0cbfd2db2e91ac2aca37b6c7390a799e765f9db5715eec141b91d4298bb0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The numerous external URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=use+android+phone+as+ps3+remote PDF link annotation
    • http://attlas.center/userfiles/file/76639908722.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/pedirene.pdfIn PDF document text
    • https://ambalatender.com/upload/files/59618465877.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/gulotujujilujitona.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/litalofukupafukeparamiwux.pdfIn PDF document text
    • http://lgassociates.in/uploads/61863155110.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/zifosofupofapoxog.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/84804405938.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/buruvakepuselafuruzuvofol.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/xowane.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/97908202340.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/xodisogaxexuvex.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330c8f2d72b---bizudozawolexape.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/vijesamijoxikilikuzat.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccc602a644---16782234669.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/soxubinemulovepop.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/20685886780.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/11002400621.pdfIn PDF document text
    • http://coffee33.ru/archive/file/gapev.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kobabumujumenosaxazi.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_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 18968 bytes
SHA-256: 45db63cd82eeeb08cb6be1e378112f5861376f853937b9becefbb1acef7ab496
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 10792 bytes
SHA-256: d3f34a8ccc4896592c69455098954ac8e6c32c0b3584aef128e2f8b9721d1770
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.