Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efce2cff5986332…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 07:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2a15510ddd1a76db625011fb9b03a23 SHA-1: 60fb784788f98d296ae817736428a007fc2afb0e SHA-256: 6efce2cff5986332f2955ddf86ddc8d547a0e0f9f8cd7a93a100ff13b77680db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites, likely as part of a spearphishing campaign.

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://laborke.ru/uplcv?utm_term=watch+love+actually+free+online+now PDF link annotation
    • http://tw-echen.com/uploads/files/202109070422173799.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/jaruzafiferibefoj.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/76802475062.pdfIn PDF document text
    • https://emenu.hu/editor_up/bivereduxu.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/87214226052.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/nomujazo.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/naxumajexaboxanipogexidin.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/14263701313.pdfIn PDF document text
    • https://fong-cai.com/upload/files/15413002596.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/zupiratomatalaluxujujipi.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/jifososolusaxukasamonaz.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/varenofarugudi.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_FA15035562895A38.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/72732043589.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wurefagiwu.pdfIn PDF document text
    • http://carbonelite.ru/file/71389223109.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/dujekilovobejo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/sipedaledopewar.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/vexejonifupewuxexab.pdfIn PDF document text
    • http://ustunongel.com/image/files/zilezeranizepene.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/73362892330.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/joxojonaki.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/zeregubefekekuz.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/90147866241.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144d77f6305e---10905338566.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_off0000c2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B9 10624 bytes
SHA-256: 6c8edc3d74633323d8a87cc83fc37515fa59c3f3989794b045221479ce120baf
font_01_sfnt_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 16948 bytes
SHA-256: 10fc03fb5afd11f22c807a4c7cd960ef2f2c2975d86f08de20101c5fd7aa84f7
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1