Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6e7d38f36799b9…

MALICIOUS

PDF

90.9 KB Created: 2021-03-02 22:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 15f0f0f06082844ea1efc6ad64226a26 SHA-1: 90b4979fa709d7129300e575df85f6a197155331 SHA-256: 0d6e7d38f36799b9782574532ee7ecf0d0abf70ed0ea2cd3da9b740c658f924c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, with one specifically pointing to a suspicious domain ('midufefew.ru') that is flagged as a link farm on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to chemical reactions, likely a pretext to direct the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wb?keyword=que%20es%20una%20reaccion%20de%20combustion%20completa%20e%20incompleta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489732/normal_5fd607b1bf384.pdfIn PDF document text
    • http://wajulosuju.22web.org/77259002222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_6039067eb950e.pdfIn PDF document text
    • http://kasumunanivux.iblogger.org/55002909786.pdfIn PDF document text
    • https://mexasazage.weebly.com/uploads/1/3/4/5/134513067/kupamakakofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_6005fe21663d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479445/normal_5ff1106e97b4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pumajuxav.rf.gd/48152090065.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/lindsey_vonn_injury_report.pdfIn PDF document text
    • http://nopilire.rf.gd/cisco_ngfw_5508_datasheet.pdfIn PDF document text
    • http://lowefukoxoxegab.epizy.com/wowulaxab.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/lego_minifigures_disney_series_2_feel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/lokebukenivisizun.pdfIn PDF document text
    • http://poweradufuxi.epizy.com/22253091333.pdfIn PDF document text
    • http://zogufisuru.epizy.com/caregiver_stress_test.pdfIn PDF document text
    • http://rarezutawuwelam.epizy.com/autocad_dynamic_block_free.pdfIn PDF document text
    • http://duginuj.rf.gd/whats_the_best_portrait_lens_for_nikon_d90.pdfIn PDF document text
    • http://birijigasexow.epizy.com/jojonadifopadibiribuf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 5304 bytes
SHA-256: f1828ddd190b9e8baae89b9227025e1e25a24f5a9b48ded61ccc9198873962b8
font_01_sfnt_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 12064 bytes
SHA-256: bd3b72788bce07163641819b22161f70034797c928f33af4a9804487f28f480c
font_02_sfnt_off0001388a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 16160 bytes
SHA-256: 2dc2c517be26df16bc4e922de18c438fae1839884c96c2875415b1717d4953f8
font_03_sfnt_off00014d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9B 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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