Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d41411d5acb53c2…

MALICIOUS

PDF

80.3 KB Created: 2021-03-04 17:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 50c0dbabe1a91fe487fdfbd5ddffb3e6 SHA-1: 2e455e0f9931f4f3fed5ce6c0d7879bfb6f2e66c SHA-256: 3d41411d5acb53c2d0b209bcb0e18fd4ad420becf5f23747dab22e04ec8bbb30
186 Risk Score

Malware Insights

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

This PDF file contains a mass external link farm, with numerous URLs pointing to various domains, likely for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain search-related keywords, reinforcing the lure strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=best+robot+vacuum+cleaner+for+pet+hair+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428039/normal_603f3f9b516a6.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/ziwufoxovikami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5fe8eb24f0e5b.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/what_is_the_difference_between_hemi_sync_and_holosync.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/cisco_sg200-26_specs.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/76041491966.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/3_words_8_letters_meme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5ff91bf38196f.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/sixoluzutosegakoloba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_601146d00de7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_052e24e78fe642df8fb079dae616b39a.pdf?index=trueIn PDF document text
    • http://tojegazanet.rf.gd/nevolanuwuwawavukidiwifoz.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_1eac8ff5d3874f27bda731510a6eeac1.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_dd47b1aca31845e5a2c847e4f78000c1.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_0df42eab1f2f4ef1891b4e6acc3a558c.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_633eb5cf37444bff97c1520f8fd14449.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2beb95fb-7b98-4c3e-9c55-e4df9ec83d5a/76784853271.pdfIn PDF document text
    • http://tofufelu.epizy.com/66587690454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956159b7-e4bb-4f71-a921-99363eee8c27/palatisozilobususepop.pdfIn PDF document text
    • http://nenedabex.rf.gd/meant_to_be_video_bebe_rexha.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 6024 bytes
SHA-256: 8ece39f7db29259db3110e10ce20cf42140eca07797af7624ca78b309f4d3ddc
font_01_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 10720 bytes
SHA-256: 1e15adae4992033aab08533f48cad14a71e53a568ad15c721e56e0dbd7c34e1f

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