Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f88f05566f44de…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 09:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e181914c14ea6ee8374c5bf7cf1f6280 SHA-1: 6ba72527388bf35f4dd6405b48f9f33e174c98f1 SHA-256: a4f88f05566f44de8705d87dd26726cf4520fb18edd7a2abc140e9ee379097c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous embedded URLs were extracted, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using link farms on disposable hosting to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wastran.ru/uplcv?utm_term=find+spy+app+on+android PDF link annotation
    • http://www.romanschatztruhe.de/img/files/dijabow.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/27957669003.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/23025907799.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210906073818.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/55936892843.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/golamotizabof.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/88354899815.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/sitenoj.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/99338097200.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/28692289116.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397720410a4---72860216364.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911155141.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/ralolefo.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/21897792662.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9fbf59015---jimobifoloduti.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/topimituvodamij.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021918_145918_499.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/venapajezefibelopal.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 17188 bytes
SHA-256: e15dad73fd0abb8672b9e0d79cf08dd50948fe199997eff4a9438e547f5f9342
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 10200 bytes
SHA-256: 2e72a20e1b03b6a2128e7e303d7e7ae387e831a93ba2c866f484a616db46b3bc

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