Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4789d172359fb6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 09:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 455dc65c118fa0d9ff137c34a33ae096 SHA-1: c432b57abed8f53a365aa8258b120076108ca04c SHA-256: 7c4789d172359fb6e73a137d9dbaebca257ec2e6990bbf367dbe5033742af081
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=c+ops+money+hack PDF link annotation
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9c2df110---59252755545.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/noborufebudepuba.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/lufewareb.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/naxijiwi.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/zuwet.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/pamimuvazido.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/vakifajesatajinejafaxelik.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/nufadurotuvuwomobamaj.pdfIn PDF document text
    • https://music-group-store.com/upload/files/wevisulutadozanatogem.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/solapatuzezow.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/tefizi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba50a509b---xedonu.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/6074123534.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/dixuzog.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/56562289987.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/girunaxelakim.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/83000918093.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/24503126831.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/fofirutawezijow.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903093052446997.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/30637628434.pdfIn PDF document text
    • http://mega.kz/media/upload/files/87149991020.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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 10540 bytes
SHA-256: bd6bb04aca92cf1c4e831f454cfa3ccfb03855cf33eb3a62fe16a35317016bce
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 17904 bytes
SHA-256: 236430ffe22e63bd46e71e21bed360882d6127d62c100c0a24b393629c9978b9
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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