Malicious PDF — malware analysis report

Static analysis result for SHA-256 887db81a4c75eb18…

MALICIOUS

PDF

105.1 KB Created: 2021-03-29 16:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b704990b27dd6d3e192769e52700bbe6 SHA-1: 2d6f3d46b4eebf1dff5e7a61e4583707dd7fbda0 SHA-256: 887db81a4c75eb1880a00214771b0e188b5df381c9a41eae924d5c5c51db6ced
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector URLs, indicating a link farm designed to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to a technical book, suggesting a lure to trick users into clicking the malicious links. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=shigley%2527s+mechanical+engineering+design+10th+edition+solutions+chapter+13 In PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/34611146573.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/68443270785.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/transesterification_biodiesel_production.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/how_to_unclog_your_vacuum_hose.pdfIn PDF document text
    • http://zilamuro.medianewsonline.com/revutomagepe.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/43844703560.pdfIn PDF document text
    • http://mandarins.space/bqokl.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/ribofulinokoynjv7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_5e81dc1bd5de4857a62b1d68d9f1ed75.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_94cbdc1908934a70919713d5eb8c1d06.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_649ddd0d94e747e98315010645e2c4ad.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_1dab3099549d45328d19d438a8e6b0b0.pdf?index=trueIn PDF document text
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_a459731b765e4139864a433e51a2d398.pdf?index=trueIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/nudesope.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/nanocellulose_market_free_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/pebenejafuxenumevekafo.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_2cf0f7065ca84f398687235c6b93f5ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/5428810281.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/rexusijixajaxuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/41015186968.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_8bd38ca3957846f5b56ce04ebb062816.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_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 6084 bytes
SHA-256: 21786ec5c4f1e8069dff8912d329f42ca075bee407c0b3ed93a80df023c84d40
font_01_sfnt_off00014625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14625 2472 bytes
SHA-256: ead06318a1650f5230a6ad3fe329905bfb4c8679596bc886f8d4976af701e429
font_02_sfnt_off00015066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15066 14316 bytes
SHA-256: 306c7046a7ce2511b3e3d36a97ed1c71b3e645fa8a591973c105a77a0a44baff
font_03_sfnt_off00018022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18022 16184 bytes
SHA-256: 5a13dacae92b941590507055fdda9bc82a3f72651e7d0a4f98161d248e3a51d7

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