Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6896e287d2393d5…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 23:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ac057b26ecf04990798e8ec7d322f6e SHA-1: 1d9781a3407596ef68e5946f6c318d7d04a8b2a0 SHA-256: a6896e287d2393d54a2bb1b9ae8f58b7e8d83352508ff3926dc78c807673770f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common technique for phishing or distributing malware. The presence of these links suggests the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7882edca4693c9769331ca7f72ebeb06/55488717323.pdf In PDF document text
    • http://onroerendgoedindex.nl/images/uploads/36118206957.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/vevosorofonexewomasun.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/rarofedabifanazup.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/luruliboronaxiwu.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/pofalevineso.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/difilovobitilav.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/32505631135.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/62635594005.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/mirusakufawizidigevubetu.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/23430972576.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/mizomipopawerepikigomo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139a5e69da---fusonalemabasabosu.pdfIn PDF document text
    • https://temahr.hr/files/86650040391.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/xepemafusegazofiwomedu.pdfIn PDF document text
    • http://twilaw.com/files/files/lofelaxo.pdfIn PDF document text
    • https://airxps.com/userfiles/files/79750371654.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16134a5c66171f---37737889907.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/95992555719.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/45171535703.pdfIn PDF document text
    • https://wecareprogram.org/images/file/pejukidip.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gopovovola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=200+slow+cooker+recipes+pdfPDF link annotation
    • 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_off0000c186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC186 17748 bytes
SHA-256: aad99292310d6518578ed810cdecdde1e01dadceee899603255676399a043669
font_01_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 10572 bytes
SHA-256: be68568a5718ac6445747944e3a6991714c876b75c0578dd34e40aa69b877023