Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a56d2de97de413…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 23:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6fe83055cb8e7604e184b5886354f72a SHA-1: 779e5bfb2cc7167e8b3aa9a9d51e4e82f685b649 SHA-256: 06a56d2de97de4139fe9f74ed925ce03634e691bd0d1f88b33262360c53ee133
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of these URLs and the heuristic indicating a link farm strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=prolegomena+to+library+classification+published+in PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37bd0d10f---mifel.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613790d44d633---seguzozogirivazabasi.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/49126110934.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/roketem.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/2709090673.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/47792890795.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/72846842471.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/69362328248.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/9240878895.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/fomexujifivazigepi.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/11487777036.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/nemorasus.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/6190091260.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/nakex.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/45225124776.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/rowotifawepixexejiso.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/38924479950.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/72736809582.pdfIn PDF document text
    • http://maidichike.com/upload/files/31514067241.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/towajixovevesisoda.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/72745368059.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/davofipigubirotitawek.pdfIn PDF document text
    • https://braus.uz/images/shared/file/kewejoxojukozefununefoko.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_off0000adc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC8 15536 bytes
SHA-256: a26c9619627ee86302420531e1609897dea7bce8c25e1f07ca4f08ef962ec439
font_01_sfnt_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 11424 bytes
SHA-256: b16297afeccebc646847a6833380daf9ac02acc682df27748d6d97bb265f9f5f