Malicious PDF — malware analysis report

Static analysis result for SHA-256 c318630b41fd1a37…

MALICIOUS

PDF

70.7 KB Created: 2021-02-16 16:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb2e857c68824cca63c8858d559babce SHA-1: 219976551d2e9220ee43fdaa189e05670e7f2d52 SHA-256: c318630b41fd1a37f03d84da4b454e1ad0adbe27dd907271af1827a8bd97e6b3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'jottigo.ru', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains text fragments that could be part of a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=jays+journal+movie PDF link annotation
    • https://cdn.sqhk.co/jebavimot/fjgiiFZ/kuwigawetuwowotojeb.pdfIn PDF document text
    • http://copyrightproblem.com/nujijizisuruvubewarimugigewrmd.pdfIn PDF document text
    • http://bigomipami.22web.org/dozakavuzopiparapase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_5fe9b21f48543.pdfIn PDF document text
    • http://salet.store/bihar_excise_si_question_paper_2019isctv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_6003f06c863cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_60286bea46fa1.pdfIn PDF document text
    • http://kismykeitio.best/filipino_sa_piling_larangan_akademik_curriculum_guidevs7v1.pdfIn PDF document text
    • http://zuvels.xyz/bovikukopeluwumikbenu2.pdfIn PDF document text
    • http://ital-tess.space/ligixebagar30bm.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/jgiaghX/62104724342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xixonu/mupezeronulirijug.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/chutkule_hd_video.pdfIn PDF document text
    • http://dizodufuxot.rf.gd/29681956939.pdfIn PDF document text
    • http://julopok.epizy.com/mobile_phone_answers_in_pocket.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/94959472901.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/wb_sc_st_obc_application_form.pdfIn 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_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 5060 bytes
SHA-256: 394bb77fe9aefdf9a63f0d691a059fad2abf2fe1170f6a61d5ce336b27fab827
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 10460 bytes
SHA-256: ab780e6463aeac9c651f95d9e4698d5398601c9e90a5c9d3e5883faa8a97192c

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