Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f60d41439f454c…

MALICIOUS

PDF

79.2 KB Created: 2021-05-09 08:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d27fd58aa25d43f1f6cff1801cab60c9 SHA-1: 7c88cf48487b7df55835b7dec46fe868028d8640 SHA-256: f7f60d41439f454cd5919887449ff92ae5a63b9f93820055514a9b9fe2c2a312
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains ('vilenefex.ru' and 'xokodiraki.22web.org'). The document body, though heavily obfuscated, appears to contain keywords related to networking ('Spanning tree protocol cisco'), suggesting a lure to disguise the malicious nature of the links. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic firings suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=spanning+tree+protocol+cisco PDF link annotation
    • http://xokodiraki.22web.org/wavixin.pdfIn PDF document text
    • http://takavejesutep.iblogger.org/nenobepizawowexamujera.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/m-audio_code_49_usb_midi_keyboard_black.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5fffb53042a96.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/amazon_aptitude_questions_and_answers_with_explanation.pdfIn PDF document text
    • http://lapugupofe.iblogger.org/86377833304.pdfIn PDF document text
    • http://muriwilosakud.iblogger.org/89926393726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_600f4a5611054.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/auggie_and_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_6064d9ef0ec11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_602037fedd6aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_e14427efcf0841b1894811c1605189ae.pdf?index=trueIn PDF document text
    • http://nonosolagosev.epizy.com/60717326664.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_af239ff4ddae4da3a1071a8e4e70092e.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_5d49c7c102224959989153f59c70debe.pdf?index=trueIn PDF document text
    • http://luxusuriva.epizy.com/www.bpsc.gov.bd_written_syllabus.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_eaeed3c9b3ee44ddb776375a5a5ee470.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78439943-2884-465f-87ef-5d8a8a1f1d3d/alcatel_3025x_mobile_phone_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/768d60a0-e855-4522-9935-f5d7f37902cd/clinical_pharmacology_and_therapeutics_for_veterinary_technicians_4th_edition.pdfIn PDF document text
    • http://lixurun.epizy.com/abhinaya_chakravarthi_kiccha_sudeep_photos.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_5eb3c2f7beb74e08a553c8697985550c.pdf?index=trueIn 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_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 5204 bytes
SHA-256: a5466622f55b410e677a33318b1d99fbefab37bbb7c6e18c6644efc6587f9ec2
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 10564 bytes
SHA-256: 7be29e51d1f106ca499ef7c2544cac245bd950afeccad2635ad7580ba72299a4