Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e2ebc1808f8490…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 13:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b929cb9f2aa82bc70338c25306862127 SHA-1: 5496fb04fa9911c7924ad00671832ad173c39f21 SHA-256: 70e2ebc1808f8490fcca163451c2c08394e336dc6d7c510c5251de2e1c960e78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The PDF structure and the presence of external URIs suggest it's designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=the+basic+political+writings+rousseau+pdf PDF link annotation
    • http://gyndoktors.de/ckfinder/userfiles/files/59352575157.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/sijetazilejegujenu.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/gowuwupazenabiwemopoz.pdfIn PDF document text
    • https://bor-diing.com/upload/files/xakarepujokifu.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/dirudifakugerotevumob.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefugum.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/sanixiwevolupofukeg.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/80518722054.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/38018303112.pdfIn PDF document text
    • https://5udua.com/contents/files/deruvanafima.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/1501371773.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/163053792945304775.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/91448953571.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/83814570081.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/2057151806.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/74071080028.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/87694821508.pdfIn PDF document text
    • http://caythuocnam.org/images/files/11187671276.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/44655238825.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/64833839997.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/44008958976.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/29429252091.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/82879656949.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/57785401882.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/3015448152.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/fazegujulipofajozotet.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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 18816 bytes
SHA-256: 8edc330a81c0117ae7f440a9d6d47dbb70e9f3a90956111c94f44288ed7554b6
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 11188 bytes
SHA-256: 770021e91f92709cef39760e2a63021c12e7123b3e6e4e54bd00c0827e7d2172