Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5a412713c5d283…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 12:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e11185b8dff139934a164d946004399 SHA-1: 5e3f000da49489a36bd0c4702cabe9894ec578d9 SHA-256: 4a5a412713c5d283fffda7bbd361b566809ddba254f300bbacbd7a41fa6c1702
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious sites, suggesting it's used to redirect users to phishing or malware download pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating a link farm on disposable hosting.

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://allytemp.ru/uplcv?utm_term=primo+pdf+password+protect PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349021ce10b---38848358156.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109070908248729.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/koxewe.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/35605047702.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/1638176435.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/89126219079.pdfIn PDF document text
    • https://polytex.de/sites/default/files/givawovatup.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6e9a759a525e1aa8e6f905b41590a67/94389956736.pdfIn PDF document text
    • http://greenglobepms.com/uploads/25530374102.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tetukefebifixisavefemiza.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/mivedo.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/buvewiwejajepob.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sexegudagokodotarulagize.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/70141034050.pdfIn PDF document text
    • https://pellevah.com/upload/files/15923052863.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210905160046.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/18976282277.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/nixizogu.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/tezotinokusiwosugalu.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_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 17236 bytes
SHA-256: 6c9feab3c367c54c6577ccee717c2cc606e387eca9bcf043deb8fe7f748b07c8
font_02_sfnt_off00013795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13795 10720 bytes
SHA-256: efe28d99f0705a2acb4e4a8bbc6d0d459e25d6cb47d3ec2b3a80c1ba09da0540

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