Malicious PDF — malware analysis report

Static analysis result for SHA-256 2450c0d16170241a…

MALICIOUS

PDF

86.4 KB Created: 2021-04-06 18:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a38d1ee025e5550cf643e6a972a1d67d SHA-1: 74dd28adfc775aa57f274922e23eb6547fbeffb8 SHA-256: 2450c0d16170241a1aa798f15b0113fa5978c42969d96ae05b478069dc5da015
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially malicious websites, such as the one found at 'https://nipisod.ru/strik?utm_term=garmin+vivofit+jr+2+strap+nz'. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the critical heuristic firings strongly indicate a malicious intent to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=garmin+vivofit+jr+2+strap+nz
    • https://static.s123-cdn-static.com/uploads/4444386/normal_60011f1031b9f.pdf
    • https://cdn-cms.f-static.net/uploads/4426408/normal_601432aa1ed57.pdf
    • https://cdn.sqhk.co/pinebiven/Cijyjie/sagebibamesijatuzifumal.pdf
    • https://cdn-cms.f-static.net/uploads/4369645/normal_603ff324377c4.pdf
    • https://cdn.sqhk.co/wimiwupo/gjsjoij/milk_chocolate_recipe_from_scratch.pdf
    • https://static.s123-cdn-static.com/uploads/4390661/normal_5febea82ea7a6.pdf
    • https://cdn.sqhk.co/tibakekavero/efYhahc/56696822884.pdf
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6011e26d311b7.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_6052516e5555f.pdf
    • http://gosofimasuwemig.iblogger.org/zaful_uk_size_guide.pdf
    • https://cdn.sqhk.co/vonirosidejo/3y25ibs/nbc_sports_chicago_channel_dish.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/234f2f1e-8e36-4518-aca9-9e89eaaaf485/public_administration_masters_scholarships.pdf
    • http://zenulasomizin.epizy.com/56637363091.pdf
    • https://uploads.strikinglycdn.com/files/5a127361-d177-4e42-8578-f6cf49457d21/33585190417.pdf
    • https://uploads.strikinglycdn.com/files/2ae01162-8d6c-4845-8cc0-54b6061a40f6/juminowira.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_8de9824389bf4c488c9ca0c58755850d.pdf?index=true
    • http://funolowudako.epizy.com/66683031382.pdf
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_fef2b84f515947aea703edfede615111.pdf?index=true
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_906dada544984c7692491a874f088ea7.pdf?index=true
    • https://dcd55a6f-f4d9-4ab7-9ea0-0dac4ffa5d6f.filesusr.com/ugd/f7cbe4_3496e859c649434e84865d6ef87a4691.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d2a8f81-dbfe-4e73-bf01-9f4762e8b146/sql_tutorial_download_free.pdf
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_9266f752099a4227963b2c1444e83b3c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6c0473ca-f613-47a0-b1a6-eaa046f3b81a/kesavavusimamusitudoz.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_off0000fa5f.bin
773b6282df8c02a753a1022f08c85d8e2ea1e535fa09ca1bf25442c5bb7b6aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 5364 bytes
font_01_sfnt_off00010ca1.bin
88cc2b8e0a31c0120889a936a870981eea63bc741cd10c7c9b9032525683d280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 11888 bytes
font_02_sfnt_off00013520.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 16204 bytes

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