Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c981425ff69a29c…

MALICIOUS

PDF

75.6 KB Created: 2021-04-24 04:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4e018095a0b0632cfc2a3b70d520aa61 SHA-1: dd0b357f9dfdce5d19ffdf1078564cfd56b5d24b SHA-256: 1c981425ff69a29c04f1f220fb988643f0cdc26ce3cdb0a044e50bb1dc476bc5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a 'basketball coach application' lure, aligning with the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/strik?utm_term=upward+basketball+coach+application PDF link annotation
    • http://nituzovido.getenjoyment.net/prokaryotic_cell_structure.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/baga_bagita.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/2908b7b5244.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/roliriragalowokozumanike.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/2a80acf.pdfIn PDF document text
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/jigakijomiduwe_femurujovu_mifijilopuvasav_kibibi.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/bugubuti.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/estructura_del_texto_descriptivo_en_ingles.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/50339705279.pdfIn PDF document text
    • https://maduzoxunixeg.weebly.com/uploads/1/3/0/7/130775653/6151833.pdfIn PDF document text
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/4f9822302f3.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_a4bffa6041d04e018b5e98af2976269c.pdf?index=trueIn PDF document text
    • http://xenivut.epizy.com/zabuvipimaxekumokorafinam.pdfIn PDF document text
    • http://zagutimidaf.epizy.com/tapebulidosidujupokuvu.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/presentation_materials_effective_c_in_an_embedded_environment.pdfIn PDF document text
    • http://vukagafiperi.rf.gd/46047941804.pdfIn PDF document text
    • http://gubojudojo.epizy.com/premiere_pro_free_download_windows_8.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_1b23738a332b4d50a39c0075c66f69e3.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 5448 bytes
SHA-256: 9b6b2477a06b768fc9db0c150e9de028599545e2c72464d01c947ffcc254be57
font_01_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 11156 bytes
SHA-256: 1ccc97ddc750abe9dfe44f7d90e1100549a09df2060dfa5b0820dbb17ed77d23

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