Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bba45edcf3bee72…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 18:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8837afc398f47001ae5ffc01c80fa324 SHA-1: ebe11460c88340e2666004f4df08e5fd9892e29f SHA-256: 7bba45edcf3bee72edd862343d44502e88716b1ac56e405e27d73ed56d0a75a0
186 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, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a search term related to 'dolls house furniture', which is likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=dolls+house+furniture+uk+cheap PDF link annotation
    • http://raifaisentgo.online/boatswains_mate_dictionaryvbzdw.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/57283866836.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/pogapurorotabawupo.pdfIn PDF document text
    • http://strgb2.ru/54264706368zrkwt.pdfIn PDF document text
    • http://spainwow.pro/jonuwc8al7.pdfIn PDF document text
    • http://parkji5x.xyz/allen_heath_zed_14_manual01knk.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/3668161350.pdfIn PDF document text
    • http://lozhobelir.space/jamaxaq1yli.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/agmark_standards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_b434d65a758347279431921f09e23f92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donarepemi/how_to_connect_polk_magnifi_mini_to_wifi.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_3bd93e3eda014e78ac9403285a1a2951.pdf?index=trueIn PDF document text
    • http://vokesakogo.onlinewebshop.net/rerezofidilakidakojipelaj.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_89b33451829948ffabbeabcfe568b99c.pdf?index=trueIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_0a224b6a51d44f93bdcab5654bbf4271.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/minecraft_windows_10_edition_1._14.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_e95caece03b3457fa2f6f5312cdc7a04.pdf?index=trueIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_e771233c17474eaf867ab381fe9ad326.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_c69351a67c8f416ba4875a554d550584.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_5b96ca0974594e778e7a9937717e9eb5.pdf?index=trueIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_9cd7955ca4bb4d7d9f6e838e4c791c49.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_2b07ac1cd60d41aeb66641743c1c1396.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawuvud/64931221546.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_eb98c78995ab48baabbe7f096da8d329.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 5164 bytes
SHA-256: 02d08204a554ac9038764f19ecb1bde065cd9197a9190d2f55a3926a2fbe4fb2
font_01_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 10660 bytes
SHA-256: f607aec39a0f02b9255b6d6f07b6ad13f550f3a9503df306d4d9d1cd6d06a029

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