Malicious PDF — malware analysis report

Static analysis result for SHA-256 07de5a661f59da08…

MALICIOUS

PDF

86.2 KB Created: 2021-03-16 12:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9db03cd2e941e428744eb12cc7e13186 SHA-1: 25b3d40f4d50a44681d6fd746b4b251fea6a6f2a SHA-256: 07de5a661f59da082748823e38e2ef6acae231f612a2e98ceab4833e037d37c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document that contains numerous embedded links, many of which point to disposable domains and are presented as search results for exam answers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack vector appears to be luring users to external sites via malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/wix?keyword=ccna+chapter+7+exam+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5fc7cea63be74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_602dcae69e107.pdfIn PDF document text
    • http://idealica-uficiale.website/vitamix_e310_costcolw7a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413239/normal_600573f8359ff.pdfIn PDF document text
    • http://sbrf.link/tom_clancy_the_division_2_3c8o24.pdfIn PDF document text
    • http://creditscorehelp.info/dexunepem2sf72.pdfIn PDF document text
    • http://abreudesigns.com/lenovo_chromebook_c330_chargerr3dmn.pdfIn PDF document text
    • http://yazansoft.com/434587798795waww.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391915/normal_5fe2523ee50b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5fcfaacdda67f.pdfIn PDF document text
    • http://podarokinsta24.online/idc_islamabad_online_reports6w8uo.pdfIn PDF document text
    • http://hookup681.site/1382839639cylos.pdfIn PDF document text
    • http://smartbright.club/beowulf_graphic_novel_sparknotesby02i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5e9d0508-bcd7-44a9-8803-ebbee29db9ec/what_is_the_story_of_fried_green_tomatoes.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_b8891395d23d43fdb6efd1bcd8071962.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_a7ead381e20240a39baba4afb459517e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68843703-0a56-45f6-a18b-f9a21b433010/2575767761.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_da2753a3c00c453fa703dad0d333db9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1e6a2d-7686-4811-9de9-5a612414303f/mi424wr_wps_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb5c44e-d225-4a29-96d3-b6a2cd45150f/nevoneluragojus.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_0aa60f3959144936a99934c1f8ee8815.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c1e3d0-1c85-4753-a0a9-3883d2e820f2/sigixudomivawevepabirudi.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_80cf29a32ab9421ab83c5ace3cea47e9.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_04e12da611684142930a7d16c6a31778.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_fec00e1511eb45e2b86c0d97b699b814.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 5256 bytes
SHA-256: 627e1ebc1593cb4a031a1da650b3b7052fe7cf02a3de630f7cde0a768b3a6aec
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 11276 bytes
SHA-256: 9fc4d225ec2084618e4f2b8c913fbc9e11d11d9994411fde9e8d64d9e2293d5b
font_02_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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