Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d3abbd888f5db2…

MALICIOUS

PDF

104.5 KB Created: 2021-03-25 08:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b0f9f87025c3dc24ce7cf69594495aa SHA-1: f0541acdeb02a9c833a81014383f89cda093b172 SHA-256: 18d3abbd888f5db2cc05b933717b9e993f82bb35ccc3598f9a7da777e675b0cc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to a suspicious domain ('resalured.ru') that is likely part of a phishing or scam operation. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://resalured.ru/strik?utm_term=what+are+the+main+differences+between+sunni+and+shia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389830/normal_5fcb9eccbf9db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_601a2fc43c3a3.pdfIn PDF document text
    • http://shishkin-seed.xyz/1213564451294qp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fda415dbcae2.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/e94d764a-6b9b-40b4-b1d7-21a70252bd08/how_much_does_a_tesla_model_3_performance_cost.pdfIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_8663e97f449645f6ae4d1faddfc6cf6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/was_green_mile_based_on_a_true_story.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/kasezemuriwoxapozajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644d72c9-f9a9-4272-96dc-4fcddfa28205/chocolate_warehouse_sale_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88629d5a-c27a-4578-b161-a9c92f792a63/schwinn_270_exercise_bike_parts.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_c94ee0214aa14d5faeb969544e6436d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/how_much_money_does_starbucks_employees_make.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/nuzasinageneja.pdfIn PDF document text
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_7a0a31cb77cd4a048efe4dba9307ec06.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 5248 bytes
SHA-256: 8fdb11f27f681a7d64a4e0c3494c0dcd4920238ca913003885697ec371c87a7a
font_01_sfnt_off00014976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14976 11708 bytes
SHA-256: 11a40f380e60da4fc70a951e5fcf6fc7dcd422439c63c7d8616c5a46eab437d1
font_02_sfnt_off000170e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E9 16164 bytes
SHA-256: 0ddbdf075a6b93c30840c956f82c28930afd570615945c5f10d387cf6e2c8926
font_03_sfnt_off00018607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18607 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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