Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0eecf7ad8018c7b…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 22:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef1a2a308e2cdc4ce6eb1b32be149e77 SHA-1: e022c86f34cd5f538abab781d6ac0eacd321eead SHA-256: c0eecf7ad8018c7bf01b8891197fca7e317ab77d523859c59331f98497fab654
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic indicates a pattern of using many distinct hosts with few links per host, often associated with SEO abuse or hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://giovanninociti.com/userfiles/files/zojazenatedatu.pdf In PDF document text
    • http://cuanhuaabshanquoc.vn/files/36223122050.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/morigituromelifawa.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/xewisowokuvadaxivirupufuv.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/visun.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161302d421f659---mikirewedukelaku.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/79624823320.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef977aa6b---xusufuvoborex.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/84705445599.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/tazileraxidoxetuditusino.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/39837822872.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/70561946981.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/jebox.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/47453055652.pdfIn PDF document text
    • https://angkagenap.com/contents/files/51830657550.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/fazunivapixamaz.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/36900816908.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/zadirujizorefijad.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/6156900210.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamagijupogetebemo.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mobovelipeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=just+make+me+believe+it+believe+you+wanna+see+mePDF 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_off0000abe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 10760 bytes
SHA-256: d597bf17befe2c1755f1551fed743fd57a3ee565f43c01a0e46c71979f1f74b9
font_02_sfnt_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 15812 bytes
SHA-256: 4243286d7cb7474000aa0bb43dc0b3fe0e9e65d78cdcd6bf4ed9d8d05b3c0f00

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