Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8465354896118e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 17:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc452797bde2642fa328d184900a89ac SHA-1: 73ac28cbc944d72349a74f4e7c3359c856e56cca SHA-256: 5f8465354896118ebafae0d5f9fd5b92ed5b46c9df4197ddda2638e29d3d55cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting a tactic to distribute malicious content or manipulate search engine results. The presence of external URIs and a link farm heuristic indicates a likely attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161333ae83a41a---367103278.pdf In PDF document text
    • http://jgbt.us/pds/userfiles/files/lonidepefe.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/ripimigogivadi.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/61000714041.pdfIn PDF document text
    • https://mauspro.net/upload/files/18627754737.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/21662460241.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/renawujiro.pdfIn PDF document text
    • https://mimpishio.com/contents/files/44952022934.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/fakixev.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/xojuzakedogo.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/84850911973.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/govavesekaxiwurekenorok.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/konijutigowun.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/kenez.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/wademiwopenujoxi.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/juxebogokigof.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/32790174648.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/37589785760.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901133051275918.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/3176946522.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/rifedirapit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+image+to+word+converter+free+onlinePDF 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_off0000c616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC616 17780 bytes
SHA-256: d0c0e8f1ca9f72703f471e06850d6d915e7f8e89a7577576d9cb3fc70d7ac023
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 10804 bytes
SHA-256: 37b7f3a1fafb449f56779e9a23360b6e76b1ed1e941b6f76930c004c4621bf8a
font_02_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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