Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78216205cb66a4a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-10 22:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aeb316de66485ea82edb2bb7df29d17f SHA-1: b8227785d227438fc2e90cba2392407814701c09 SHA-256: b78216205cb66a4a23aa4f253f7feafb2ca3802429d4153b123ab4f5e9ac9630
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, suggesting it's designed to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests a spearphishing attachment vector (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=complete+squaring+method PDF link annotation
    • http://www.masozilina.sk/ckfinder/userfiles/files/xabanexepatexobeg.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tegugo.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/gotuzosokufatese.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/sokejopofof.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/73672984939.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7540d87b556e35e67d7a8541fd6d04d8/botonolasoxidore.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/39129345727.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/liburoserafofufo.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/9512414445.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/70589217582.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/nujanejopogamaba.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210902080036.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/pamasular.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/33884700862.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/mafepajojalowag.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135659119c26---32317468937.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/xakutozibojazibabi.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/58880048985.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210907164958699236.pdfIn PDF document text
    • http://flexa.cz/docs/file/83517454126.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/23506558377.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_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 11116 bytes
SHA-256: d6d6e641289b42eff9f1905f0bf4c920763abcf13339e299fe0cf8d2c6e30a45
font_01_sfnt_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 18812 bytes
SHA-256: 912e32b762bf27adce910aca81d9d0a08949cec2e8329dd8811dc8e9100b34f8
font_02_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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