Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01dd609d223bcd5…

MALICIOUS

PDF

76.0 KB Created: 2021-04-02 03:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82c119bb941273d4cfec7eb6ee702d42 SHA-1: c7b420c1dfa54a6d4f7f6ef1d1330d42f3e85832 SHA-256: c01dd609d223bcd55911ac2e3a17f7d654d64c88bb5ff4479685a05c2c848c20
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link farm attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crophysi.ru/award?keyword=science+of+bakery+products+pdf
    • http://mobeditobaxul.scienceontheweb.net/budidaya_rotifera.pdf
    • http://jalosus.mygamesonline.org/kefikefol.pdf
    • http://newsportstechnology.ru/meant_to_be_song_lyricsdn73p.pdf
    • http://geesecam.com/mandated_reporter_certificate_mainef93hz.pdf
    • https://static.s123-cdn-static.com/uploads/4418362/normal_5fddbf0b25d13.pdf
    • http://mini-camera-super.club/63327980103u02ja.pdf
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/7558768.pdf
    • http://sberbank.services/what_to_do_when_your_vizio_remote_stops_workingth7mg.pdf
    • https://cdn-cms.f-static.net/uploads/4470205/normal_602aeb9aaa7b3.pdf
    • http://rapisakaxo.66ghz.com/21642231401.pdf
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/4227741.pdf
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/3044017.pdf
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/paxufogibumi-zasod-gejuxutipo.pdf
    • https://lapunowelozod.weebly.com/uploads/1/3/5/3/135337348/luvijo_wedopuxudubiba.pdf
    • https://cdn-cms.f-static.net/uploads/4530937/normal_5fd7d1d12d0cf.pdf
    • http://bawimip.sportsontheweb.net/how_to_program_my_hearing_aid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kubotupixa.rf.gd/folewasamibaluvaza.pdf
    • http://ziwuxokivob.rf.gd/vejeruwozowejesog.pdf
    • http://bapexuzajo.epizy.com/69534248725.pdf
    • http://fikenojidukozo.rf.gd/xazokarijilenexera.pdf
    • http://noxukimu.myartsonline.com/affidavit_of_support_income_requirements_2020.pdf
    • http://jifisuxevizek.myartsonline.com/argas_reflexus.pdf
    • http://kenupavif.epizy.com/animal_abuse_essay.pdf
    • http://sovuberexizizir.epizy.com/bevirivuvuxinibizazod.pdf
    • http://zikifivetijunu.epizy.com/bratstvo_crnog_bodea_zvijer.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5d.bin
a2f18f268d159df1790a68483f90b55592aaddaf1058768195ca1cdb487cc6aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 5528 bytes
font_01_sfnt_off0000fd3e.bin
bd120d7194fd5504fa174e5397d8b60cfde612c9f2726616204ac64903916bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 10392 bytes

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