Malicious PDF — malware analysis report

Static analysis result for SHA-256 003289ab20d87ad8…

MALICIOUS

PDF

87.8 KB Created: 2021-09-13 19:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb13d0c8fab500e30ee83b788d84ce5c SHA-1: b7c2a6f3ec56783441148bf32b2f7c53be95f489 SHA-256: 003289ab20d87ad8cbbec857568ea41f22b088d106d007ab7016b8806dfc5221
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://tattica.byespresso.com/app/webroot/files/upload/files/30197992684.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/xexamafijurukaku.pdf
    • http://pjzhengwang.com/upload/file/20210906_043555_191.pdf
    • http://rheinmotel.com/userfiles/file/1456111348.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d3af26aca9769a5adaa98888da34a454/fisarakakute.pdf
    • http://sochisushi.nl/survey/userfiles/files/guvuxatizujovozo.pdf
    • http://ladyvenus.it/userfiles/files/taxobezep.pdf
    • https://ctcitsupport.com/media/files/dutojafadenakakezer.pdf
    • http://sk-uralstroy.ru/uploads/files/fadovubevugozerenutowube.pdf
    • https://support-trevianum.nl/userfiles/files/vilek.pdf
    • https://stka.gr/ckfinder/userfiles/files/dapanap.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1d4ffa70ad3fd0f714262d83f359fb6b/mexadarenufulafu.pdf
    • http://limobebe.com/userfiles/files/pokigalojufezo.pdf
    • http://santamariamikado.com/uploads/files/27321817892.pdf
    • http://baobianhkhang.com/upload/files/tajotigokudikavuloror.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905230330.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/tugaripo.pdf
    • http://ingegneriarossi.it/userfiles/files/87876356074.pdf
    • https://organicearthfiji.com/documents/file/53742582240.pdf
    • http://amghanoi.com/images/ckeditor/files/liputelibasaboderil.pdf
    • https://pasarangroup1.com/contents/files/rutenexavegajemo.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/1346387496.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=grammar+tenses+pdf
    • https://www.posluh.hr/ckfinder/userfiles/files/11600507830.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c8.bin
0232350a47b6dde259d80665dc447f00f811f14eaa777d6fafc636cc38d00cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 18592 bytes
font_01_sfnt_off00012227.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
font_02_sfnt_off00013a3e.bin
4bfe1d47933e7f1ca40788ec76b39cd6a47931af9fa4a0a36aa055c27924a73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 10440 bytes

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