Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6426cfb7e249460…

MALICIOUS

PDF

92.3 KB Created: 2021-09-21 04:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d656badb8de282dfa113edc347c78e9 SHA-1: 47e67e5b132d9ccd9eaa235523b8843c75ed2a64 SHA-256: c6426cfb7e2494608e253791773825a3edda7d17709740a9ae754867fe2e9829
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous small, distinct links on disposable hosting, often with UTM parameters, which is characteristic of phishing campaigns aiming to obscure the final malicious destination. The presence of a direct IP address link further supports malicious intent. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=download+latest+chrome+apk
    • https://vsetinrally.cz/userfiles/file/30988246010.pdf
    • https://gkia.org/kingkong/userfiles/files/82865132912.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614672380f428---gawojovetojikoxataxuzulab.pdf
    • http://com123.vn/uploads/file/553621799.pdf
    • http://plncse.hu/php_data/file/tularixa.pdf
    • http://rfychina.com/upfiles/files/16317770038071.pdf
    • https://coonvalleycc.com/userfiles/file/78662453919.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/65516984130.pdf
    • http://tuecpa.com/file_media/file_image/file/66042415855.pdf
    • http://www.peretprod.ro/content-images/file/matokaluguko.pdf
    • http://nexxstep.nl/userfiles/file/47282650173.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/38293645182.pdf
    • http://serramentisiciliano.it/userfiles/files/winuzolofilekadameseto.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/17779221695.pdf
    • http://machulski.com/public/file/lovinosizejesagok.pdf
    • http://kotrackusa.com/fckedit_file/file///20210906_19_51_24.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/37319863244.pdf
    • http://carrozzeriardue.it/userfiles/files/lijofa.pdf
    • https://sopkambing.com/contents/files/dedozosulosa.pdf
    • http://kleinschaden-expert.com/userfiles/file/26538377475.pdf
    • http://fishingas.com/userfiles/file/murukebimufemi.pdf
    • http://185.33.116.145/~acus01/upload/files/10240152187.pdf
    • http://shanghaiqingchen.com/upload/files/nebij.pdf
    • http://heorungminhphat.com/luutru/files/61787454807.pdf
    • http://odontotecnicacoop.it/userfiles/file/14386225807.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e622.bin
9c8d3a2e6b4b29a9887d86ca6a31de604baa8f3814f4751b811cd6846152b7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 17840 bytes
font_01_sfnt_off0001142e.bin
c4191826116f638600b5edcd88bf2b7af5dedc09f37a3b8241c2e760b83d5452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 10868 bytes
font_02_sfnt_off00012d30.bin
013a38717f9e6be53792fe56939ad342e4aa2ec409cd6a0114d474bf0c066d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 18344 bytes
font_03_sfnt_off00014a88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A88 16792 bytes

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