Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f73ddb64596553…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 02:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a784bf2982a50faed15bedf25a9987e1 SHA-1: 12fc40cea1fa9c0f274c30b4cc265c9c99e6231b SHA-256: 35f73ddb6459655388e741c956f67652b8d8cb92d6ec5090d0136332427e2262
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is structured as a link farm, likely intended to direct users to malicious websites or download further payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of tricking users into believing they need a password for an archive, which is often a method to bypass security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=fifa+2021+apk+obb PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb758b486c---56653378387.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/zavatawopulugagajoteloz.pdfIn PDF document text
    • https://ms02bet.net/contents/files/puromizizumakulokeduj.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/1473337786.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/vuwudu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/22350060875.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zivafividefujobidiwib.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ada9d1888bebda36fb00c71595fff70c/3527904358.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/76234731467.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/powobez.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/69620464048.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92707103021.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/41097821716.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-1/20210901075519525831.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109100656183452.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/bumojufilivuto.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/35203169000.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/32639843571.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/xamovasoxago.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/puxadugeb.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/vojuvonakudonuzipawovur.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/9386798824.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/51590182949.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/duxewixipazikolomuvaba.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/davapozamod.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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 10204 bytes
SHA-256: b6017a8d29ead22a7adae9d11a8d67dccbd637cb0d58b6c63f7104b41ec143eb
font_02_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 18688 bytes
SHA-256: 4713abbbeeeaadaaaa302abbbe0bca4d1d582271a83b82a54e5d5961757da0dc