Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c475eb958f954fe…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 20:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05b87b99a9bdc5d605a8e4adddd1672a SHA-1: 99765593a6931ed499eed6888a8d686c55c2aa79 SHA-256: 9c475eb958f954fe050a398af74eeb70e0a83fd9f161c183c0056dd0f9ff8ad7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with a high number of distinct hosts, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://savages.lu/imagesRTE/files/8769380051.pdf In PDF document text
    • http://gibisch.com/files/files/xalegatexe.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/69770809974.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/zubozevineno.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/36140826793.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/84144643842.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/10439252872.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/giwapesemezuvewoguw.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/moseworebun.pdfIn PDF document text
    • https://ratodua.com/contents/files/turuxut.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c769d4fd---3039578986.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/kipibarar.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/71284800995.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/jujakataxadijixijo.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/zuwakijepiwoworalab.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/3479442986.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/61315716580.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/gibipikudumerijuvow.pdfIn PDF document text
    • https://lecachet.fr/docs/files/kovejag.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/tenirekiwogul.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/84477340063.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/26481651390.pdfIn PDF document text
    • https://southafricapools.com/contents/files/26518138192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=is+aha+available+on+firestickPDF link annotation
    • 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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 10684 bytes
SHA-256: 6ef333d0f409c6590f9d4c556a9d20305860fa3a1e02d9dfdd04d162b6f17e9d
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 18192 bytes
SHA-256: 66084076e08475ee18447f58d8752fdac4ceab048e811353ac20de73db6dad39