Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9c33bc72eae762…

MALICIOUS

PDF

83.4 KB Created: 2021-03-19 17:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 83d1a1a153075e912f03edf9732b5cfb SHA-1: d3c3a7ac0937b84293867c7e44a8e35eb15059a0 SHA-256: 4f9c33bc72eae76295173116794133c674be56830005a44c1ade466a4416a08a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, contains text related to creating a 'fake certificate of authenticity', aligning with a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/aws?utm_term=how+to+make+a+fake+certificate+of+authenticity PDF link annotation
    • https://cdn.sqhk.co/taduzotul/icie5dZ/vusuputigepu.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/7qXgjgd/70607759930.pdfIn PDF document text
    • https://cdn.sqhk.co/foletesubuf/Jo3hegd/kusewoxuxixazidukug.pdfIn PDF document text
    • http://klosheff.xyz/reaper_miniatures_kickstarter_2019ptv81.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/cjfbREK/ivory_white_color_palette.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/39287529661.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/Tn1Khh7/bubble_bird_rescue_old_version.pdfIn PDF document text
    • http://wetiludivarag.scienceontheweb.net/wordly_wise_book_7_lesson_15.pdfIn PDF document text
    • http://naturka.space/ancient_chinese_religionsgd9j.pdfIn PDF document text
    • http://sy0n.icu/algebra_1_questions_with_answersabjsw.pdfIn PDF document text
    • http://gunofixe.medianewsonline.com/fiddlers_fakebook_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/jbjd2ha/camouflage_minecraft_skin_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/UQiawgf/universal_sound_fx_download_pack.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/electrical_blueprint_reading.pdfIn PDF document text
    • http://bestgirl69.com/79662057839r7vq7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/aluminium_cladding_sheet_density.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/born_a_crime_audiobook_chapter_6.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/almaden_performance_auto_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/ambient_weather_clock_manual_ws_8365.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/basic_english_grammar_online_course.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/vb._net_2010_offline_installer.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 5128 bytes
SHA-256: da444b16f3221af86d8948b59fa9a687667fc06aa496bcedb2cdffa7927f2234
font_01_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 11148 bytes
SHA-256: 011b0625ad8dd0d337327d26a017fc0e3d82ece2852f8a878452743c87e8ed84

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