Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca1d82cb48d413b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 09:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4363a22b0a0b6c2357c213b9e1d351bb SHA-1: 8b71235e44b87fa8c0cb5bc010eb522771304aac SHA-256: 6ca1d82cb48d413bae5c17dae4b75f5884989e9e286fc58d74086e82cd0aa232
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are structured to redirect to PDF files, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to distinct, potentially disposable hosts, reinforcing the phishing or malware distribution intent. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://oniceh.ru/uplcv?utm_term=how+to+get+imei+in+android PDF link annotation
    • https://e-motorcycle.tw/upload/emotorcycle/files/biked.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/56885435232.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/rawawoviduwono.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/buwanexufi.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/saziduferofenon.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/fevevu.pdfIn PDF document text
    • http://timocomputer.cz/files/file/8475703211.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/21091356714.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/80032239380.pdfIn PDF document text
    • http://www.moyekolodin.com/files/dituzofufafukivukatikit.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/bumojawogamomegofo.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/lozadasamijezizalupijiwu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/21420458941.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/31232364939.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210903_04BC215FE9FC247B.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5756fdc18533aa856a1ff54dfafdc4a2/39209964550.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/21b879846a247f9ebaef7b99b58934b4/negetizakumogerikavexu.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/95437382457.pdfIn PDF document text
    • http://nfc.soo.jp/file/jakijuwugojigamim.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/12444874645.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/muluxebugevujigov.pdfIn PDF document text
    • http://artospace.com/pics/file/vejotipus.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_off0000ac7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7D 10456 bytes
SHA-256: b5e3e879db193dadab92619fc7544e6af6bef5e98bc8ecee9bb05cbcae19a9d2
font_01_sfnt_off0000c3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FF 16264 bytes
SHA-256: f038a6397cdcbf51fe192135f6917a438aad6749e4a162e77d623763579a7bfb
font_02_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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