Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacf30f455acf8e4…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 08:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fe00b29619e4fe08e2262f9e6a12c1c SHA-1: 8e0879e9f7d57e31a89e0aed11b49a7a40a21d4c SHA-256: aacf30f455acf8e49e8076118f8258b0d7a1e4717efd18ad65c851ea65a7962a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://philabc.ru/uplcv?utm_term=list+of+hacked+games PDF link annotation
    • https://businesslife.com/content/files/sifiresaxewanomemasezi.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/difulegajafenaxepo.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/20491108785.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/88017843937.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210907_FD1B41CC9A72786D.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/8128066152.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/90536714553.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/zogarukilalekurigiv.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/94598001417.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/8223073199.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/90705739920.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/89936984623.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/13906787272.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/72355651402.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99abf08a5---doboxanole.pdfIn PDF document text
    • http://canoeing.by/pics/files/6540932440.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/80030436511.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161342afd41cfe---luvisuz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lidulamegaj.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/80069811254.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/gefizimawivexolelosiru.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/75144623502.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/52451975220.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/perefan.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34066351305.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/fupedawamipewuvej.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_off0000b476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB476 14432 bytes
SHA-256: 05dbd34659e707acdd9ec055eb1b245a2a8791dbd7c71aa9b2635289e548c980
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10724 bytes
SHA-256: 6ad93e6222772eeb2055eb91f91813a1c78788e13e6433a9440df37b9c0e3101
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1