Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ff17fd03582418…

MALICIOUS

PDF

79.8 KB Created: 2021-03-29 09:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fe793940eac360e0da61ad2771c3330 SHA-1: e7dd1cffa9303e2d91333810cd178ab0ac6160fc SHA-256: 76ff17fd03582418725ef59c069e8453fa7e8305de58d85ba7f50d1bc64515a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file is flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to distribute further malicious content or engage in SEO-based phishing. The document body, though heavily obfuscated, contains text related to 'excel macros vba pdf free', aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=tutorial+excel+macros+vba+pdf+free
    • http://manthoughtswebsite.website/information_technology_manager_interview_questions6fru6.pdf
    • http://topmassage.net/55400168422qeftq.pdf
    • http://bonifacy.site/sexy_sims_mods7emzh.pdf
    • http://fresh-ita.space/why_does_my_first_alert_carbon_monoxide_detector_says_endh1u8w.pdf
    • http://zootime.store/482811982469fn7q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b7ec174-7b78-4bbd-994d-0a59d4a9ed36/69297471341.pdf
    • https://uploads.strikinglycdn.com/files/0e90d82c-c71c-4d16-9569-fdc0fec75448/analogies_worksheet_3rd_grade.pdf
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_7057d4e5add74ac799413fc27e34ac20.pdf?index=true
    • http://jematino.rf.gd/universal_jumbo_remote_codes.pdf
    • https://uploads.strikinglycdn.com/files/56b92248-d700-4654-a41b-c86144189a9f/sinomumojegoxogiruki.pdf
    • https://uploads.strikinglycdn.com/files/23e9dd2b-ac4e-49f4-a1cf-25aa7526c4ed/lemiwebilewepisif.pdf
    • https://uploads.strikinglycdn.com/files/6352c9b7-482b-4d2b-9e51-c21783f74be0/bexafefaniw.pdf
    • http://nekanonesogur.rf.gd/sukalamotoguvuxifepibozik.pdf
    • https://uploads.strikinglycdn.com/files/a272d23a-f5cc-4e34-a39c-5f3ee56872bc/whittling_chip_card_requirements.pdf
    • https://uploads.strikinglycdn.com/files/19801c98-7477-4d48-a6f8-2bab57d8d6f6/87185667531.pdf
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_8add66acbf82491db2c89c8b02c887c6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f58534d-a7e0-457e-81a7-89d409980ccb/is_a_15_dollar_tip_good.pdf
    • https://uploads.strikinglycdn.com/files/b333df11-438a-4ed4-b4a0-2d305e97a527/data_warehouse_interview_questions_folks_talk.pdf
    • http://rajuleneto.epizy.com/lovimonedidilevikan.pdf
    • https://uploads.strikinglycdn.com/files/316ba9a2-54f4-4c03-96fc-528568c6a96a/dungeons_and_dragons_dungeon_master_guide_book.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_209eecde488f4e3880de1983bc8ab459.pdf?index=true
    • https://uploads.strikinglycdn.com/files/200ad52f-2836-4247-87e6-3bb9ce31e7cd/power_plant_productions_wedding_philadelphia.pdf
    • https://uploads.strikinglycdn.com/files/003cbec7-a210-40ce-9faf-aa26fab1ebbe/niguwatekefuz.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_off0000f85d.bin
4dc588484a98ac46bf19093fc605240f9583a4c07414c286ec8682adfbbb547e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 5520 bytes
font_01_sfnt_off00010b06.bin
67478b7909efe9e23760ec290d007cc42eec9fe913253ab608e93675524294cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 11444 bytes

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