Malicious PDF — malware analysis report

Static analysis result for SHA-256 4287f142b94e737b…

MALICIOUS

PDF

78.6 KB Created: 2021-04-06 18:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7c5721c931e0be03ee41d09cc4af602 SHA-1: bedfacc8e318857aff293e912addc8e999768d43 SHA-256: 4287f142b94e737b0aca5ea6a48d71dfffa095eeccc83bbd50d45b1e7da6dea9
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The document body, though heavily obfuscated, suggests a lure related to law enforcement, specifically the 'West des moines police department', likely to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/wix?keyword=west+des+moines+police+department
    • http://magic-spring.com/samrat_ashoka_tamil_movie_songsw1e0o.pdf
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/nugog.pdf
    • http://alcozerox.com/botivinus1yvdw.pdf
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/duxeve.pdf
    • http://votamomitep.22web.org/53302000252.pdf
    • http://pojegan.22web.org/ill_be_gone_in_the_dark_book_sales_numbers.pdf
    • https://zulitaxovali.weebly.com/uploads/1/3/5/3/135351491/9ad58a405c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xigavekokerir.epizy.com/beading_techniques.pdf
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_1b2ef472f4294b4799c29793e5616433.pdf?index=true
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_d10c70c969e84ac3a0fa7b860f6b39ea.pdf?index=true
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_fabca30fde4441beafb3a40e2520a505.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9cdebb52-57ed-4821-9fd2-bc083fe89f84/91708850449.pdf
    • https://uploads.strikinglycdn.com/files/facf3242-dd9a-4e0b-ab15-a0b1ba14efe4/82916745266.pdf
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_036d5d9ab4854e75998c7ff61da1a425.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f688.bin
56a93e46e47fdadd7d2877eeff3dcb867afbbde2f4af1f59644bb0dae983b028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 5232 bytes
font_01_sfnt_off00010848.bin
b41af8f62da9f40e0ad493d1e98e91ca0fec195332b44bd881ef68838c0e7a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 10928 bytes

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