Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1df0974b24457eb…

MALICIOUS

PDF

71.6 KB Created: 2021-09-13 08:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f17e73c699e28943c9aea07962ded91 SHA-1: 924cecef183d19145d6a752f35c5812677a08908 SHA-256: b1df0974b24457eb183cbf35d0738089e55403f21a37ac469e7b9abe7f4edb57
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://moyaexpresss.com/ckfinder/userfiles/files/4920381679.pdf In PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/magesoxem.pdfIn PDF document text
    • http://bdnchem.com/upload/files/nunijowaze.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/29476637896.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/1222024950.pdfIn PDF document text
    • http://torgoborud.org/images/file/logido.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/20164710679.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/dadetafodedimud.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/korusa.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/41619286367.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/bikeku.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/kimedowokagegusi.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/vojunoful.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/62311131088.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/tasavopudagefuvama.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630792488.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/94440629834.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/83542967632.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/99679897999.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909222139285419.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905153338.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/dewewuvubaso.pdfIn PDF document text
    • http://elma1.ru/!upload/files/80604853330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=crash+tag+team+racing+para+androidPDF link annotation
    • 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_off0000b485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 10944 bytes
SHA-256: c6e18c6969d2a99f95b6b06a8a1f1540aa726ec97b4988007ae31d3bf97eaead
font_02_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16716 bytes
SHA-256: 67c08085f2a432b8fe1ebdd214aa2e859acab4462910de40829e8744441d2027

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