Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3537841b4e6c359…

MALICIOUS

PDF

76.8 KB Created: 2021-02-12 11:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 717e8c925aae66ee341eaa59c855ea58 SHA-1: 18d619f8e89acb10d4dd73920521c0decc7836e3 SHA-256: d3537841b4e6c3595a15971c9f51921dfbd48958d362c902bcf9dcc665e3c88f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and link farm characteristics strongly suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=i+like+to+play+basketball+with+my+friends+in+spanish PDF link annotation
    • http://vipmanmarket.space/cinematica_dos_fluidos_exercicios_resolvidos04ak1.pdfIn PDF document text
    • http://onenature.space/320170651884dq84.pdfIn PDF document text
    • http://usesalon.xyz/google_chromium_free_for_windows_735w3b.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/xojamekitorabumilewesonub.pdfIn PDF document text
    • http://fastcreditreport.info/industrial_accident_investigation_reportf9d61.pdfIn PDF document text
    • http://buyfastedcircle.xyz/hetman_file_repair_1.1_crack_downloadoclkh.pdfIn PDF document text
    • http://minuette.me/answer_to_a_math_problem4hoqp.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/nighejc/kabejo.pdfIn PDF document text
    • http://grafoanaliz.ru/interrogative_sentence_examples_with_answersh9dtl.pdfIn PDF document text
    • http://how2clever.com/the_hurt_locker_1080p_megakfvtj.pdfIn PDF document text
    • http://urott-hu.com/718105733118hmiw.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/O5iaggv/canon_imagerunner_2525_drivers.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/hhhc1xn/swatch_definition_scottish.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/J9iejhN/27113289100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulifuzefusuw.rf.gd/arma_3_project_life.pdfIn PDF document text
    • http://pixagikaw.epizy.com/sf_181_form_ethnicity_and_race_identification.pdfIn PDF document text
    • http://xofivijisaja.rf.gd/hobbies_worksheets_reading_comprehension.pdfIn PDF document text
    • http://xekababemaxukop.rf.gd/kuvegoteramon.pdfIn PDF document text
    • http://tixixomevupot.rf.gd/apk_adobe_photoshop_untuk_pc.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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 5616 bytes
SHA-256: 9289000736d336c56f7ad7a43f0ff6807ac23057344692c027b7b1d306769b92
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 9692 bytes
SHA-256: aa58e15082af8310909e10a7289a31ca6b7010e2197de825a20d96ca885ee299

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