Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afe19f531a9dbe4…

MALICIOUS

PDF

73.9 KB Created: 2021-04-29 04:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e2f6aeded5be93952069b709eccaebd SHA-1: 44f28d999b0f71ffed7f675838c7e11afd03be69 SHA-256: 7afe19f531a9dbe48c37d7688ba1e958c5f4c0d90fcb48295650501baa6efc6a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan. The presence of numerous links to disposable domains and potentially malicious URLs suggests a campaign to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://jacksth.ru/strik?utm_term=no+grain+no+pain+recipes PDF link annotation
    • http://sujabupinoda.scienceontheweb.net/84597726661.pdfIn PDF document text
    • http://ig-copyrightnotice.com/the_prince_and_me_3_full_movie_free_onlinelf1um.pdfIn PDF document text
    • http://votapusi.mypressonline.com/58324379747.pdfIn PDF document text
    • http://meriline.store/80200524759ucij9.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/35838350076.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/peneratubexuraxumogad.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/bixolon_srp_350_manual.pdfIn PDF document text
    • http://vykupavto54.ru/620465767011dapq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojosotum.myartsonline.com/45859951714.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_aab126eef9b743d3a704440d91fe3b29.pdf?index=trueIn PDF document text
    • http://nupuzawov.onlinewebshop.net/28966680044.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_88047822d98a4f469d5f19f074c0193b.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_0cab84e8ac964e869319d8d31c3c3f4e.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_9cfa2a70c474435db0fd72ec7f4d1c5d.pdf?index=trueIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_ec68cb470e5c4875aaf51a35a51ddb10.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_705f33c2b7004f8987eeae1d28bb9b5e.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_7781e7a64a6e43eb90b75fab97870ecd.pdf?index=trueIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_e81bea46bd71470a8b70eb923b1cd7b6.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_531dd4a923a2470abb0fbe97f704d929.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_8455b4755eff40679872dfaedadf2cd9.pdf?index=trueIn PDF document text
    • http://lewinozed.atwebpages.com/what_are_the_five_key_relationships_of_confucianism.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_6dfd68cd47984e14b9c701ccc95f3b30.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_be2b984603e545a9a13affea6fe6ee79.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_36f3701f456e4a1b9931660eab2075c0.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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 5040 bytes
SHA-256: 3066576a4714c5532f5655860bbf084b4bbe43d8d400e31be2de3b54a85fe321
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 10824 bytes
SHA-256: a9076bbe6bb7d17dbaad44bcd65a175973eb26bee9134047c2f99e5a348fae5f

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