Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c1b27aa80176a0…

MALICIOUS

PDF

85.2 KB Created: 2021-05-12 01:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de83112645228c363340f5e54000394c SHA-1: 3726bd231b5c437b069e5c3c703ea8cd19808d55 SHA-256: b1c1b27aa80176a012f4beb50fd20c9605b56aeb0498cb6f1e65daccee16d08c
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to academic topics, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=quantum+field+theory+in+curved+spacetime+parker+pdf
    • http://tipijijajofupi.sportsontheweb.net/virtual_assistant_proposal.pdf
    • https://bizunasudene.weebly.com/uploads/1/3/5/3/135345394/sipopurasod.pdf
    • http://gidilakapajuke.mywebcommunity.org/birkary_poly_9.pdf
    • https://bokakuvuzojoji.weebly.com/uploads/1/3/4/3/134351808/vumenatet-xapagaxa-veworadup-pomotugabi.pdf
    • http://besefobusim.mypressonline.com/24849586129.pdf
    • http://wijofotezopadik.medianewsonline.com/air_fryer_recipes_for_frozen_pork_chops.pdf
    • http://dopogabijup.mywebcommunity.org/book_bird_bin_sachivalay_paper_set.pdf
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/tewomugi-mujogasapodofoj-wufoxixa.pdf
    • https://veselamo.weebly.com/uploads/1/3/1/4/131452803/nobulamefe-zorel-suvuzaje-jikivavepolu.pdf
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/fowet_ganatevinitet_libilenevip.pdf
    • http://zevewidojodot.mywebcommunity.org/is_the_canon_ts3322_printer_compatible_with_chromebook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tajavuminona.atwebpages.com/93858962808.pdf
    • http://lozedigoj.epizy.com/solving_quadratics_by_completing_the_square_worksheet.pdf
    • http://kuzebelinebofe.epizy.com/menezaxopewez.pdf
    • https://uploads.strikinglycdn.com/files/c42aa824-13d1-4109-9f1b-9f8f6ac3ab3c/mba_supply_chain_management_jobs_in_bangalore.pdf
    • http://jigisasamupor.onlinewebshop.net/72576884578.pdf
    • https://uploads.strikinglycdn.com/files/a11444bd-ebfd-4b0f-b411-591991fc33e8/how_to_measure_performance_in_healthcare.pdf
    • https://uploads.strikinglycdn.com/files/30efd6ba-a4d8-46b5-a313-732c49fbb058/how_to_trade_intraday_in_kotak_securities.pdf
    • https://uploads.strikinglycdn.com/files/5f1b1135-2b32-45dd-9046-3d31a8336c1d/sfu_wellness_wheel_quiz.pdf
    • https://uploads.strikinglycdn.com/files/19033777-f42c-4c2a-a741-436b48561ac6/how_to_thread_a_kenmore_sewing_machine_model_5186.pdf
    • http://xizokokov.epizy.com/coulomb_law_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/ed56691c-4879-456e-95e9-4461f82044af/16758619250.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f718.bin
edd316e94ba4aa0c74325c7209b1f096e8950fc5416d4b110556a0ce65a5e9b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 5680 bytes
font_01_sfnt_off00010a54.bin
bd942abf42c87f6a5cfa2fc502296d3bdbff690a1d46e30b0054f2d663072d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 12196 bytes
font_02_sfnt_off00013181.bin
da133098c8ec00180ce5fe37c74b807b143adc5860869a2f7b6211e455203b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 16112 bytes

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