Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3a155e9ec244fd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 21:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac832739e86197d4c846ba0b92a2ad41 SHA-1: 910d7a0357bb36c64c79087b166d101275d3cf76 SHA-256: ea3a155e9ec244fd47199d58de561230495babf816c9403d9096e85cfb8b2661
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the presence of multiple URLs and the heuristic firings point towards a spearphishing attachment attack pattern.

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://smidgel.ru/uplcv?utm_term=mobile+security+premium+apk PDF link annotation
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/gobatonum.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/18014330092.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/58284132082.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/kenubozenu.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/10726027349.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/49318857389.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/ruxonopababiju.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca71c7d18---67429625893.pdfIn PDF document text
    • http://hrmconsulting.biz/upload/files/76562657015.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/xuwodowetet.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/radabixigoxib.pdfIn PDF document text
    • http://thaismenews.com/userfiles/files/1049340942.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219141511532694.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/55179566043.pdfIn PDF document text
    • http://unityproductions.com/upload/files/xegitosuzaxazab.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/38139877433.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/24847016128.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc5a11145---mebinepe.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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 10872 bytes
SHA-256: 1ad078d8c534edaacfff2de62d27fc55a06a36b89260d6ce61156cbe8d44643f
font_02_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 17236 bytes
SHA-256: f52223432b8e5b27918bd7370a27ea30aef1a85cf1b9967b3bce53d5836876f7

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