Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd87ad99e69db13…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 20:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 026dc375d12eaba3f077c4a7e72e9ec2 SHA-1: dea7131790b3036afdcb23a4d8802cd958fae931 SHA-256: 4fd87ad99e69db13a623b5693a73040d3a9590b4dea632d4ed2bfc705bed7cc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute links across multiple low-reputation hosts. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to redirect users to malicious content.

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://aakritidigitals.com/userfiles/files/65937478573.pdf In PDF document text
    • http://80tner.friend-match.com/upload/files/rotederatud.pdfIn PDF document text
    • http://greenglobepms.com/uploads/ruwuvekejogalopi.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/faguvurebuzakobegitapoke.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/89394788793.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fusuroraxuzeji.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tejasuvasutevanos.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/27789785578.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5cc81d9d---57127656646.pdfIn PDF document text
    • http://nanopena.cz/upload/file/31303688926.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/56923616795.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kebulep.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/82093597448.pdfIn PDF document text
    • http://consade.com/userfiles/file/8985212392.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-15/20210915174955331619.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/petejone.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tebofuxutakolenimenaxolab.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/dunawazepajoj.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/70759028301.pdfIn PDF document text
    • http://compsult.net/userfiles/file/menobopefefemafep.pdfIn PDF document text
    • https://combrooncom.com/contents/files/49931162020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+freeflix+on+firestickPDF 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_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 10600 bytes
SHA-256: 2bc5675d374853513dee8e9383bb1dadcbe79875fad98f859c31496bcc6860b0
font_02_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 17684 bytes
SHA-256: 8192fb0217e83368edc5f1e4f8df442737963bbd4fcebe928eeaef516b08e947

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