Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7b00c71df2ef50…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 12:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b2a1c8c13f5013a8fc6de455bbc4a44 SHA-1: 791560b5701736e0cdc777425ec19134d67e0505 SHA-256: 8f7b00c71df2ef50e088230fb7967d2efa3ad6cfc660873a58c7906eaadfed8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://mezovuduw.ru/wix?keyword=link2sd+apk+root. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=link2sd+apk+root
    • https://taralibupub.weebly.com/uploads/1/3/4/3/134372711/jokujunusuxovu.pdf
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/ebbd64ef.pdf
    • http://turiwovezaz.iblogger.org/non_veg_salad_recipes_for_weight_loss.pdf
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/1477369.pdf
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/cc945c3a2ac.pdf
    • https://sutomoloxoxe.weebly.com/uploads/1/3/5/9/135986515/c4c05f26c56993.pdf
    • http://xutarima.22web.org/aberraes_cromossomicas_estruturais.pdf
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/padirisorava.pdf
    • http://sefexetewizu.iblogger.org/tongue_cancer_journal.pdf
    • http://logivojem.22web.org/vunigutaremuligubidid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_148f3aacc14c40b492f1a0c308196283.pdf?index=true
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_15559a7f3a8541369fbb211c3ef2bcf8.pdf?index=true
    • http://viposesarob.rf.gd/adobe_captivate_guide.pdf
    • http://gopudagob.epizy.com/small_business_answering_service_reviews.pdf
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_1f78276dea89433e965147189b37f402.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d23817d-9323-4eaf-a025-0f0d8d50e625/final_fantasy_xv_ps4_trophies.pdf
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_61a42a08aa4f41bfb2ce753473508a9b.pdf?index=true
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_a32fdfa66bf644ebb97f02d0785749d4.pdf?index=true
    • http://sadakukozami.rf.gd/tratamiento_de_absceso_cutaneo.pdf
    • https://uploads.strikinglycdn.com/files/faa32ad9-1874-4c35-abf5-cfd0b1ab0ea2/canon_scanner_lide_210_user_manual.pdf
    • http://retudazugo.rf.gd/does_spirit_airlines_charge_a_cancellation_fee.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_off0000f5e9.bin
94e374be0f845db411a8a330440ee50b5de5e375e629dc7b574d3d3725f46a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 5056 bytes
font_01_sfnt_off00010730.bin
77df30b04829a69db5f60e384f6624075e6ae805df136913abe341770b45fe73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 10776 bytes

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