Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b88bf902302a849…

MALICIOUS

PDF

78.5 KB Created: 2021-03-02 15:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d5db9b2361d6de1202a6121c5ca33bfc SHA-1: da24cf3ef87625c6aaf2b1c70bed17766e92c8a2 SHA-256: 3b88bf902302a849e7650167c8b038d33180a53b22e4e29eb2d9e19168542014
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a search query, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=what+is+the+american+dream+in+the+raisin+in+the+sun PDF link annotation
    • http://raruvutemogogog.iblogger.org/tuxibewawikenivupawidude.pdfIn PDF document text
    • https://vubutebifakalax.weebly.com/uploads/1/3/0/7/130775259/jasug.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/kyocera_taskalfa_3551ci_fax_operation_guide.pdfIn PDF document text
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/7711900.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/eclipse_for_selenium_automation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepirag.epizy.com/25988923992.pdfIn PDF document text
    • http://woloruvikato.rf.gd/demographic_information_synonym.pdfIn PDF document text
    • http://kanulinuwuri.epizy.com/rafuvuzalepivumulu.pdfIn PDF document text
    • http://dodupubi.epizy.com/google_spreadsheet_api_javascript.pdfIn PDF document text
    • http://poxemibusap.epizy.com/62315334497.pdfIn PDF document text
    • http://gevalej.epizy.com/dorigivod.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/pibarab.pdfIn PDF document text
    • http://vedumojaje.epizy.com/cartoon_couple_images.pdfIn PDF document text
    • http://lediwetopoj.rf.gd/30158383661.pdfIn PDF document text
    • http://kegeduwamid.epizy.com/things_to_consider_before_buying_a_car_insurance.pdfIn PDF document text
    • http://lozabozirazal.rf.gd/80221588322.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/96569063307.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/jack_and_the_beanstalk_story_map_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/2018_acura_mdx_hybrid_owners_manual.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_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 5160 bytes
SHA-256: e198699951788ebeb6165d087afa36a3abe9da7078f7498e3c08239da608e7c3
font_01_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 10868 bytes
SHA-256: ab3bbc1f10372b31fbec0edbfe0166677ef9d78c16e707aae326b92443aa6847

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