Malicious PDF — malware analysis report

Static analysis result for SHA-256 8613b41dc732c727…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 11:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1e2b1bce951dd4ecf4b082ddfb85f15 SHA-1: d6dcac5d54f0d272c3b0806345d1a0fb97057295 SHA-256: 8613b41dc732c7271c77ebbc0a96b6b9bcbe42b930e3fd1b22f4ed9612da89e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it directs users to phishing or malicious websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=free+romance+books+online+pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/xixobubetusabenulalubam.pdf
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/99355662522.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/dapojofutamadibajewaxeje.pdf
    • http://gaushalango.com/uploaded_files/userfiles/files/42278927659.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109061002297465.pdf
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210926153900.pdf
    • https://tyeetomsfishing.com/userfiles/file/43630099008.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/38652676847.pdf
    • http://mdsalon.ru/img/lib/file/81926868620.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/sitemugidelubefa.pdf
    • http://agama-rc.com/upload/files/77958532214.pdf
    • http://gilendor.cz/userfiles/file/vakazuwesivonedup.pdf
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulilaxarubo.pdf
    • http://biplano.eu/userfiles/files/63422499148.pdf
    • http://wine-paraphernalia.com/files/winep/_repo/file/vufusokaxejezixiru.pdf
    • http://familie-schiecke.de/images/file/biromiruzuperinaluvare.pdf
    • http://cutskytools.com/d/files/giviretedog.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fe6c2530e---xijiwakebezolovagolibi.pdf
    • https://5ky13lu3-1251.com/contents/files/28315662582.pdf
    • http://sushiyaslo.com/uploads/files/18640151060.pdf
    • http://ecole.ru/text/images/file/97254533390.pdf
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/furogagumajozujafar.pdf
    • http://hastensandbreakfast.nl/userfiles/file/74513207451.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B7 16792 bytes
font_01_sfnt_off0000c8ce.bin
73a53a28b70c3d0880fd6223ccc735e4fc4814861cdca3b6d098b6088249755a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 10892 bytes
font_02_sfnt_off0000e1ad.bin
72e16365431a7373fba345cf5d89d7dc08760101d727625d613a6fddd61458d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 17308 bytes

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