Malicious PDF — malware analysis report

Static analysis result for SHA-256 f746c5bc7e9db446…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 23:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ed224eb1f36629c79707d317de3556e SHA-1: 66559a4c790d7a113c1377415ae5c52b38859daa SHA-256: f746c5bc7e9db446fdb971f37a4adc6987ce8658f86c5538fdafa7415bebcc68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=rajeshkumar+novel+free+download PDF link annotation
    • https://adikketiga.com/contents/files/91693873649.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rugabeliduxupolunolazupe.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/27371871948.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/gabuvilizijadujunosu.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/xumen.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/zuvetadomik.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/regoxetasisojatema.pdfIn PDF document text
    • http://briztravel.com/upload/files/85051493376.pdfIn PDF document text
    • https://dm288.com/slicice/file/guwutodivasugoxixe.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/31514103635.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/nibajofobadijozijoxopas.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/bulajozapilufemobolo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/38793693490.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614384d11a36a---92839063787.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/kudafituboxodixojarek.pdfIn PDF document text
    • http://dfanchem.com/upload/files/64314543561.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/81749837455.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xanomukew.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/kunegibarosafaxifezifer.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/57371436257.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/15680050338.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/99981167129.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fuluse.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632042856.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_off0000c9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 18488 bytes
SHA-256: e7c63d6713a85831b818660efba0b60dc393cff2ab3d7e01f8fdc8aec38301a8
font_02_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 10948 bytes
SHA-256: 0180179a21eec10a169b0fc33afe715726b8649a3be19267773cc52ee22bc2d1

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