Malicious PDF — malware analysis report

Static analysis result for SHA-256 63817bcd27be37e7…

MALICIOUS

PDF

98.5 KB Created: 2021-03-24 00:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a70e5e18ed156e6bbc70d251eeac842f SHA-1: dd95dc91f1fa1c822b4289bc1327a9ec8a39e552 SHA-256: 63817bcd27be37e72c941d3c281212fbb6085d3fd18e80dd92ca3bf61d13fbb3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to PDF files hosted on file-sharing services, indicative of a link farm or SEO poisoning tactic. One of the primary URLs, 'https://jumiwimov.ru/wix?keyword=geometry+angle+pairs+worksheet+answers', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=geometry+angle+pairs+worksheet+answers
    • https://bogibopedazite.weebly.com/uploads/1/3/4/0/134018154/2147615.pdf
    • http://ses-paypal.com/zebifixolefmmt0.pdf
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/4191516.pdf
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/8788649.pdf
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fed828782fb7.pdf
    • http://ctyr.ru/razer_firefly_not_showing_up_in_synapset35az.pdf
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/8958887.pdf
    • http://gratoraama.space/tupugebofabixemefewfe1r.pdf
    • https://cdn-cms.f-static.net/uploads/4414860/normal_601840fd35f15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fotojipifuzitul/teamviewer_mac_10._10.pdf
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_b9c990e99994490a97eb0bc6f466c278.pdf?index=true
    • https://s3.amazonaws.com/zusevamasor/magnification_and_resolution_worksheet.pdf
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_582cab8ec3e641938adcd0611902a2e2.pdf?index=true
    • https://s3.amazonaws.com/fuwenoxuzasila/30149067603.pdf
    • https://s3.amazonaws.com/zatazewoz/doyles_guide_employment_law_barristers.pdf
    • https://s3.amazonaws.com/nuxomigo/commas_worksheet_high_school.pdf
    • https://s3.amazonaws.com/sugosubexez/rawuxakisaduda.pdf
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_9dc7903243d64bd7b905429c32c543eb.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139d7.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139D7 2828 bytes
font_01_sfnt_off000143d1.bin
75d5e8cea2440d4ab809a8c8fcbd92b5216596b364f81902d5c28e015aff6566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 5520 bytes
font_02_sfnt_off00015686.bin
4cc4a50422b4de70980d05fdf7b296f011ae0c42eea40f9500df1c1438db4099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15686 10740 bytes

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