Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2386ff346cda823…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 09:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3db5461c30f635eede423312d7466025 SHA-1: f7718140a406fd110044a6761160f473f5771210 SHA-256: a2386ff346cda8235002b4b0b21d316cdeb3b4df2fcce655e9ea418bbd94c3b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and the presence of many links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=crime+and+punishment+penguin+classics+pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/78676858740.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/lekazazitala.pdf
    • http://autoneza.cz/UserFiles/File/luzamekakufejabonuko.pdf
    • https://hebatkeren88.com/contents/files/18791513706.pdf
    • http://vntattoosupply.net/uploads/image/files/98446082183.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df713178ac---mapemebetaw.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d06f5359a9---76850153308.pdf
    • https://jeneifogaszat.hu/cikkdata/files/99482002738.pdf
    • http://pluimveebeurs.com/userfiles/file/jejusibam.pdf
    • http://skia22.ru/pic/file/lilixo.pdf
    • http://gdlejia.com/uploadfile/files/20210902_011943.pdf
    • http://phukhoabacninh.com/images/files/93402712288.pdf
    • http://keralatravelpath.com/uploads/file/41793718300.pdf
    • https://rainbowprinter.com/app/webroot/files/file/puxiri.pdf
    • https://latgalesamatnieki.lv/files/file/88736205039.pdf
    • http://rigdrilling.org/userfiles/file/69842382044.pdf
    • http://rajskiewakacje.pl/userfiles/file/35796911356.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/41181911817.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/vefanamugegusosej.pdf
    • https://marljivo.hr/UserFiles/files/15075228767.pdf
    • http://cokhihoaiduc.com/uploads/files/20531951765.pdf
    • https://mashtalkandil.com/userfiles/file/75386688356.pdf
    • http://vakaruinzinerija.lt/userfiles/file/vijikuworuvetufupunosu.pdf
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/zogiwufinoxusufusozakew.pdf
    • http://e-motyle.natura2000.pl/imgturysta/files/mawuwatojeka.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_off0000b7b6.bin
133ff3e0b807b8c1e9aaa9213dc56ac9147ad23b1c6c1e46506ea8974b532f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B6 11076 bytes
font_01_sfnt_off0000d117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 16792 bytes
font_02_sfnt_off0000e929.bin
0b9487f301aa8e6f6b032bb3e47bd1217d4c531f419407a577cd3be2e43b9bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 18732 bytes

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