Malicious PDF — malware analysis report

Static analysis result for SHA-256 a105907407f90000…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 05:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4dea0d3e98d50eaa3ed26e16be1e812d SHA-1: f7c84ffbccac6d527cc3f3fd2fa3e34b1ed01b46 SHA-256: a105907407f90000c7bd7590d13e7fb4ac792b5fb5f79ee76145a3cb928365ba
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/123?utm_term=the+book+of+the+damned+supernatural'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=the+book+of+the+damned+supernatural In PDF document text
    • http://vitalia-transports.com/viwamosepekaranuzasiniou11e.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/gciRPS1/mekubafonitabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_600bb32bd8072.pdfIn PDF document text
    • http://vinnipoh.space/nodizatoyyi9.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/85316318165.pdfIn PDF document text
    • https://cdn.sqhk.co/gimanoretev/1jhwhhI/occupational_therapy_salary_mcallen_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/aje8acc/75900796936.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/which_type_of_humidifier_is_best_for_dry_skin.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/ygeNfQm/backpacking_first_aid_kit_checklist.pdfIn PDF document text
    • http://tublitalia.fun/460852589501d53a.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/tanikanaw/descriptive_writing_prompts_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/treatment_of_anemia_in_ckd_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/86470765003.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/40451689612.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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 5432 bytes
SHA-256: d42aa514696ac00774714283340ed95975c0b51c7870a9a055c180f1aeca2995
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 10180 bytes
SHA-256: 454615b4f21e2dd3e7b0129bd1840e51f37d550a1e77a71684542f7291c14da6

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