Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fbf359ff753237…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 08:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6626705f54e26e61e4a7f2d711af6a0e SHA-1: d0369366ccad2b9f0a7b7d9a593b05c0ce398796 SHA-256: 57fbf359ff75323776784b80d8f79071e4df238efdefdcc47e940cdc1d5df312
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=math+input+panel+android PDF link annotation
    • http://aktifbant.com/resimler/files/23348171375.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/pibakosewu.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/mupudof.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf184e694---92917715755.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/23760817104.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/64599608454.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/tefokozikubofuz.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161357a3f3e4a4---xezoxevapibirafun.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/34689390407.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109111029315889.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/rinasodetugirosile.pdfIn PDF document text
    • http://hongdacable.com/d/files/93562259871.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/remitavotagevedalidotiwut.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/pipuxafevujodolutada.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/tegakovolasojozipi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///sobirosuxusujuxixewaduj.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/divelasuramig.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/71696941527.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/jowiniguvoru.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/pofudu.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/gabas.pdfIn PDF document text
    • https://sinarwaja.com/account/files/sajizujadegepigarefotur.pdfIn PDF document text
    • https://castel.ro/userfiles/file/47699745986.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/37675259238.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_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 10412 bytes
SHA-256: 59babd278c2e979a4df4d7630428da31e333aff409efa7b60976d31e4b7c828b
font_01_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 17084 bytes
SHA-256: c448235974031a4a8faf1f124ff7d612694d48ed118dbe52151d98b8c46ca631
font_02_sfnt_off00012729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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