Malicious PDF — malware analysis report

Static analysis result for SHA-256 233562d553e5aa36…

MALICIOUS

PDF

120.8 KB Created: 2021-03-22 22:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c9c528323584f9fc0d0f5bc16e3e0ea3 SHA-1: 2650c085ae1f5b3ff1afedad8c3e1b88b1ae9c1a SHA-256: 233562d553e5aa36dcdc57cc28697eb09d5bd24d38d9bec7ef52b5b5d3dfe813
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to '600 sins in the bible' and mentions 'wkhtmltopdf', hinting at a lure for users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=600+sins+in+the+bible PDF link annotation
    • http://ersoil.fun/tabletop_water_fountain_kito1bcn.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/mugoginizasu.pdfIn PDF document text
    • http://axecheat5.xyz/vewewujudadowoxiwizilx1mj.pdfIn PDF document text
    • http://goldstein.berlin/primer_escudo_de_costa_ricar051c.pdfIn PDF document text
    • http://arevakar-travel.com/wazataraloraz0aco.pdfIn PDF document text
    • http://sopafekidis.sportsontheweb.net/padafilewu.pdfIn PDF document text
    • http://artistichomesolutions.com/command_and_conquer_ultimate_collection_megaa1jbo.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/how_to_replace_battery_in_honeywell_alarm_keypadz712w.pdfIn PDF document text
    • http://newsportstechnology.ru/zosuxabanexozedigagojuwugj9xl.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/coreldraw_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/dt9ghid/minecraft_education_edition_seeds_for_village.pdfIn PDF document text
    • http://poradoit1.site/91481549457ku6ao.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/Giitja4/nasarilujopenuvesulog.pdfIn PDF document text
    • http://raifaisentgo.online/public_speaking_lesson_plans_for_high_school_studentslw4lm.pdfIn PDF document text
    • http://meetsol.xyz/bawolumuxopaniritijibadgnl32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://somepezepu.epizy.com/how_do_you_write_a_self_evaluation_essay.pdfIn PDF document text
    • http://posofopi.rf.gd/senior_mechanical_engineer_salary_nj.pdfIn PDF document text
    • http://sedegagagojuwej.epizy.com/34827789722.pdfIn PDF document text
    • http://pavasokunise.epizy.com/prisioneiros_da_mente_augusto_cury_download.pdfIn PDF document text
    • http://lajefuvubesij.epizy.com/junitulajiva.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/abstract_nouns_worksheets_for_grade_6.pdfIn PDF document text
    • http://rebivik.epizy.com/85958653731.pdfIn PDF document text
    • http://wapinogure.epizy.com/penivas.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_off00019db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DB4 4808 bytes
SHA-256: f0e50d58fbcd0af3d2da8a634e0b763b1a4b89d1bbde0089bc6a113772e5c36b
font_01_sfnt_off0001ae0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE0A 11232 bytes
SHA-256: 9153f0d03fc8d802e24bd132e77d0f0bd207b75a1cbd324e10cbfd32ddc1c286

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