Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35cdc27788d031c…

MALICIOUS

PDF

93.8 KB Created: 2021-03-18 23:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dfc1fb89442db27cacd87b9d7062d8f SHA-1: 5d0172ead9fa333942ec0cbf047a5cc2a22a0945 SHA-256: f35cdc27788d031c58e334be09e8e2a89e7062c4ae8d3892aa6e1d852723f009
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The primary URL observed is 'https://druttle.ru/wix?keyword=eid+dates+2015+south+africa', suggesting a tactic to generate traffic or distribute malicious content through SEO manipulation. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to redirect users to malicious sites.

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://druttle.ru/wix?keyword=eid+dates+2015+south+africa
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/sobipojarofufefugi.pdf
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/1314042.pdf
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/gegiraben.pdf
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/5440f55897.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vukumesoj/65811512502.pdf
    • https://s3.amazonaws.com/kaxukok/8912854510.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_d502b6272fcb4ec1903d3a8bdcadd0bf.pdf?index=true
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_3401b93670f740a4a3490d8e9f5830c8.pdf?index=true
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_431ad1b644f44cea8c10f8e3f6fe29c1.pdf?index=true
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_6420030c406e4692ae9aee4e5a82ace2.pdf?index=true
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_40b84bfb27564a28ad4da92da409e506.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_c84897296ec0400e9cb2e781c9bc46ef.pdf?index=true
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_ca32ddc1147547058244ddf5dcafded5.pdf?index=true
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_31a8f0a191874ba8a8df3cc1f4e3a378.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8004f82e-a5b8-49c8-93d7-56fdee38a60e/could_the_stock_market_crash_in_2021.pdf
    • https://uploads.strikinglycdn.com/files/26c930bf-8277-4890-b9fb-5c810c73b643/92368900069.pdf
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_0be651171a1b41ee860c78f577246576.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
    • 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_off000114e6.bin
79dadd37daba9df8d9669efe5078c6321344911e2bc98c164ba386bb264a2890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 5484 bytes
font_01_sfnt_off00012794.bin
5cf0baa80fa18ebd91cf504f027852992963ae37bc4118c940fea35abeee7882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 11412 bytes
font_02_sfnt_off00014e2d.bin
7db5a28e83698ed77a7c8bccdbafca9b99fcd7cf0aae873711974b235c16f506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2D 17976 bytes

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