Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcf07473a3cef4e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 16:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ac149e8d71c8a595cb262155600eff1 SHA-1: da8558a87caa5e2c63b3422fc9eef79ecc7f32b3 SHA-256: 7dcf07473a3cef4e46396d5fe5b5aca337d90bb3a922c2b1b2f116dde81dc1ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=internet+explorer+9+apk+download PDF link annotation
    • https://onutglen.com/caningest/images/file/15505625289.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/19339626019.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/15430759947.pdfIn PDF document text
    • https://nistd.in/userfiles/file/fisudiwetesobaxi.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/37329336888.pdfIn PDF document text
    • http://teledirk.com/d/files/26511171910.pdfIn PDF document text
    • https://ivanamihic.com/files/badagesodegakabap.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/77754759528.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/18006980415.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/987053968.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/14387622812.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/varutuwuxix.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/relilesale.pdfIn PDF document text
    • http://infunplastic.com/d/files/xumisonozedulogimuse.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/11309823806.pdfIn PDF document text
    • http://santehnika34.ru/images/file/34894967637.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/59393529988.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/nusanutopavosi.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/9551563294.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/59680220127.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/14299465002.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/tuwirukufederaxupefazu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/53222293302.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161423983ed3fd---25680983062.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/muligisitopuw.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a4ebc140b2ded6470f9fa0b539af3012/13997890198.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_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 17576 bytes
SHA-256: 03df4343da95faa61c1abd630df5b4554e42f3bc840d9ba6dbc2812c9ce9a696
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10524 bytes
SHA-256: e06353d9cbda1a70209c84a4528019f7355908e07c0ee7f05f3db3afc7118374

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