Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1d411ae45be244…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 21:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eba0bce6012fcf79ad93a56393e16397 SHA-1: 263ff9f47f0c853b6e19d252426091b2f602e084 SHA-256: 8d1d411ae45be244d6c25c01981fe59937ff804a1ec25931b248d4f8745bab78
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=unity+ios+camera PDF link annotation
    • http://plaschke-partner.com/uploaded/file/674643873.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/45133122887.pdfIn PDF document text
    • http://sbkf.org/files/files/wubabumira.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/wejunawekuwumogosovogux.pdfIn PDF document text
    • http://hodori247.com/uploads/files/buzenitiwojorejetoli.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/xoduxiwel.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/67959124001.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/8195357315.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/64204893805.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/11806362738.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48662734879.pdfIn PDF document text
    • https://blokhol.com/upload/files/87321951959.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/jumimomerot.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/zesut.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/womazopopezeduxopis.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/90292780700.pdfIn PDF document text
    • http://elpijisystem.com/file/5904896569.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/24520397050.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/kalewenap.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/vopotuduvabixibosozulajaf.pdfIn PDF document text
    • http://gapp.fr/medias/files/vitijemum.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/15420057579.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/4484935389.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/60018598181.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_off0000b541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB541 17548 bytes
SHA-256: 4cca76644279f8423fbef15bbd1a5236608d717015678967ce30e9c62aba23d4
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 10468 bytes
SHA-256: afa54e95ed9937f06bcc941450e201b1d1d41855616436ecabba6e9d99685fb1