Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8138b6b5d56061…

MALICIOUS

PDF

79.2 KB Created: 2021-05-09 13:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 85741a57d9c8323d8df489e9a5bc9c45 SHA-1: 787bc8b4f179f4edeb08b471819f31088738ef2c SHA-256: ff8138b6b5d56061f650d03b1180af67e595145702da19f7d5764b55131a9081
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. One prominent URL, 'https://mezovuduw.ru/strik?utm_term=how+to+clean+tiger+rice+cooker+lid', appears to be a lure for users searching for information on cleaning rice cooker lids, likely redirecting to a malicious site. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+clean+tiger+rice+cooker+lid PDF link annotation
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/siwufofalilok.pdfIn PDF document text
    • https://vajepagipe.weebly.com/uploads/1/3/4/0/134000011/9e6fcc4bcedc710.pdfIn PDF document text
    • https://xuwobonamufaguw.weebly.com/uploads/1/3/5/3/135315698/2600496.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/konovikadobo.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/4166235.pdfIn PDF document text
    • https://potezevaledu.weebly.com/uploads/1/3/1/4/131406960/36d76b2c1ec0de.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/voteximisudem_jifuvijokemide_jituvopimozifu.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/kipep.pdfIn PDF document text
    • https://derufobi.weebly.com/uploads/1/3/2/6/132682106/c355a171c90.pdfIn PDF document text
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/79473ee.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://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_942a0f153eea411ba7deeb0928b6d605.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_e11fb796a408474f98f100f3fc2f417f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af6851f-e2f1-4856-b8d7-f82d0c017e7b/68940965174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30100ad8-b2e0-48f9-a1c4-d1431f27e584/84004522969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acb49bc-4ad6-436d-93da-4354d46fc7ea/jawajuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f600b125-27bc-49b9-8d3a-6989c13cc58e/35137528698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07a1848-4c99-4ea1-8f17-1ff0444813cb/ar_15_optics_walmart.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_818db707a12d468cbb65f06d47f69574.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab5119c-4675-421d-85bf-d60dc95547b6/58689642370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2513eda5-dfe5-4b9c-bc08-d1c6285e5f89/what_are_the_8_rhetorical_modes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47db7159-010d-453f-8c8c-e94879fce151/kesugaperiridede.pdfIn PDF document text
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_30671984d47c40a8a274d3b06371d100.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b100562-fd0e-4ffd-a7e2-ae487b2e56d6/46189246682.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_15b08787c9f94cdab216c0065b015677.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de65363d-eb5a-47c0-81ef-ca100376bc37/jepopuwukimebudenosasib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 4836 bytes
SHA-256: 18e4b19dcadcc98441fdb9fccba17ca9345e0eb0d2b351e2d11d9aeabb13afaa
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 10484 bytes
SHA-256: 4c5f47250074a9e21313809cb2bc1f9867364f3c1042f414733b3795891a5ee9
font_02_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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