Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc408942164fc98…

MALICIOUS

PDF

69.4 KB Created: 2021-09-23 15:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 004d4f94a4f16f96d790d0a637f76d8e SHA-1: 6fedad50215ca43db9eabd8657c2a47c65ddc453 SHA-256: 7dc408942164fc989c124a339dda98f531146eff06a2303cea46e607971bb195
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple high-severity heuristics, including PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS, indicating malicious intent. The embedded URLs point to suspicious domains, and the ClamAV detection as Pdf.Phishing.Trojan confirms its malicious nature. The PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=download+modded+android+games PDF link annotation
    • https://inprovitperu.com/ckfinder/userfiles/files/kovomanafek.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/winexiletosigasikon.pdfIn PDF document text
    • http://zenithmetals.com/files/nijunevivirapudoxo.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/99131475329.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/vofojomefete.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/misawubavaseguvu.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/1430253569.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/gozolugujeliwad.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/bilul.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/16221221248.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/fegufojobivegazixosegi.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/47233726853.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/bizeru.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/najebibalaw.pdfIn PDF document text
    • http://orthodoxnews.us/file/95012300853.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vgpfbmmvdq4lr4jvhguta4gc83/47419910643.pdfIn PDF document text
    • https://fptica.ru/images/file/nexetoginufe.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jadifavexuvepizawegibip.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/92041626182.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210919093013.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/28158331888.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/86389528012.pdfIn PDF document text
    • https://camelcarpet.org/d/files/59739932713.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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 10580 bytes
SHA-256: 3d2d82cb2eca6b2ce6b5c8838671551f399399273a3d17e1ab11abd5907f2ad3
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 15232 bytes
SHA-256: efa4659f0825d9fcc389928c61b22d5ed51bcde7eb304b603f7bf1ccd9509a34
font_02_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1