Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d0dac1bbfe3ba7…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 00:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 024f1a2dc55a32635aaa5e23a72a7769 SHA-1: 28449b642bdaf3458d05da98ed5d5195d4d6ef85 SHA-256: 19d0dac1bbfe3ba7480f0e242e9181e4567879a1f2254dc50fdb8b70369047d5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The document body, though heavily corrupted, suggests a lure related to 'great commission worksheet', aligning with the observed URLs.

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://jumiwimov.ru/wix?keyword=great+commission+worksheet
    • http://lnstagramsupportinfo.com/32708371000uhyax.pdf
    • http://nazevulilabume.66ghz.com/grammar_worksheets_for_grade_5_free.pdf
    • http://porizaritofo.mypressonline.com/did_you_get_it_spanish_worksheet_answers_level_3.pdf
    • http://vashmaster.info/momazadxt4w.pdf
    • https://cdn.sqhk.co/rapawaferew/mw3jaQa/risk_dice_probability_chart.pdf
    • http://timedezalug.iblogger.org/housing_market_crash_2020_explained.pdf
    • https://cdn.sqhk.co/taxeseta/hjFhgbw/xilinumopo.pdf
    • http://0fruits.space/yeast_fermentation_lab_report_introductionyirtx.pdf
    • http://amsidisi.xyz/the_dot_book_online_free8tpae.pdf
    • http://gopevuxojadizob.22web.org/russian_formalism_theory_slideshare.pdf
    • http://fakutuzogazu.sportsontheweb.net/kusexewugu.pdf
    • https://cdn.sqhk.co/fusureviweki/ccjeEiW/dental_assistant_jobs_edmonton.pdf
    • http://fomigiv.mypressonline.com/sql_join_query_interview_questions_and_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ziwunoli.epizy.com/38962134663.pdf
    • http://kafopazam.epizy.com/88504454965.pdf
    • http://pabizazixivak.epizy.com/fuwiwotavagixuwokava.pdf
    • http://vebojikabugoxa.rf.gd/runojoxojuvudewu.pdf
    • http://lanowabu.epizy.com/adding_fractions_like_denominators_worksheets.pdf
    • http://kezosofudan.rf.gd/mad_girl_bryony_gordon.pdf
    • http://peruroz.onlinewebshop.net/zuditukoruxomusizip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f659.bin
f1aef54683037b5c1e0742033216cb57de1a2ec342f065de081a83dc714deb78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 5196 bytes
font_01_sfnt_off000107e9.bin
876ef4c5021111c3011fb88e61a1117ca5c4bbba3cef5d2746e72353b575a50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 11084 bytes

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