Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b3440fdd25ffc2…

MALICIOUS

PDF

91.5 KB Created: 2021-02-14 11:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 45e2c110893787e2036c4b3623283ee5 SHA-1: 907fda4464a7b1314eeaf16faa1f0e2a94c9439e SHA-256: 59b3440fdd25ffc221e4aef5c39293ca2cceafb1c19e3b398251ab5d13488983
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is 'https://crophysi.ru/wix?keyword=county+of+los+angeles+minimum+wage+ordinance+2019', which is likely used to redirect users to further malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://crophysi.ru/wix?keyword=county+of+los+angeles+minimum+wage+ordinance+2019 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4419441/normal_5fe535ca2d2e5.pdfIn PDF document text
    • https://fisulujat.weebly.com/uploads/1/3/1/4/131454297/3255858.pdfIn PDF document text
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/bevasofibid.pdfIn PDF document text
    • https://memelixuluxowi.weebly.com/uploads/1/3/5/9/135958522/c8805.pdfIn PDF document text
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/6829081.pdfIn PDF document text
    • https://bivorafonesakal.weebly.com/uploads/1/3/6/0/136021739/4835263.pdfIn PDF document text
    • https://lidukawovov.weebly.com/uploads/1/3/5/3/135323160/7509354.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_6008fe63be934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_60128832630e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5fdf5b1d4eeb8.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/8901990.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/006b22d8ab6.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/4924322.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://s3.amazonaws.com/dibedamoka/allen_answer_key_neet_2019_p3.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/i_serve_the_soviet_union_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/wetisiduvokojibozipikojuk.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/facts_and_opinions_worksheets_3rd_grade.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 5924 bytes
SHA-256: bb1898e71d224d34f43c28e369c9096b6eebaff28fefa9dd0466110071ccf539
font_01_sfnt_off00012efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFA 10428 bytes
SHA-256: 9f5e0d505b2f9505773d8445d5516cd7859d17e30bda143d75307688f20ad5cf
font_02_sfnt_off000152a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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