Malicious PDF — malware analysis report

Static analysis result for SHA-256 e579bb7173696186…

MALICIOUS

PDF

74.0 KB Created: 2021-02-10 09:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 41cc444654a1c4eb2014bad09dce1b02 SHA-1: 76276eb9c91782126d8e969ab0aa8479cea7837a SHA-256: e579bb7173696186c79abfc144e10efb783b3564b9d77d5ff5579db359ba9c27
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. One of these links, 'https://baarspo.ru/123?utm_term=72+oz+into+lbs', is flagged as unknown reputation, suggesting a potential malicious destination. The ClamAV detection and ML classifier also indicate maliciousness, likely due to the nature of the embedded links and the PDF's structure designed to manipulate search engine results or lead users to malicious sites.

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
  • 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://baarspo.ru/123?utm_term=72+oz+into+lbs PDF link annotation
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/8642329.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/aaron_blaise_photoshop_brushes_free.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/4162067.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/momegad-vowiv-mabid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_60107f7a6027c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496193/normal_601ddae9de2b9.pdfIn PDF document text
    • http://nalutomabesuso.iblogger.org/wuxonesoxus.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/japotuput_sisudiwug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5fe097c56e3cb.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/venamirinixobovapux.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/33cc433fda52151.pdfIn PDF document text
    • http://mijogunabisojil.iblogger.org/girekepizajidoz.pdfIn PDF document text
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/8385f9d0c4.pdfIn PDF document text
    • https://zilisekisami.weebly.com/uploads/1/3/1/4/131437354/givilife.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/9fa619ca0.pdfIn PDF document text
    • https://midusafamiriron.weebly.com/uploads/1/3/4/7/134702540/jupise-wiwegewele-fofulozebene-saninigabibiwoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zewimu/microsoft_word_2010_cover_page_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/debussy_nocturne_sheet_music.pdfIn PDF document text
    • http://zorogeloma.epizy.com/fafamavasedorokoraxatewo.pdfIn PDF document text
    • http://xogebaf.rf.gd/67337470223.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/shoot_bubble_game_new.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/ugly_christmas_sweater_contest_template.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/confidant_conversation_guide_persona_5.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 4680 bytes
SHA-256: 45aaaa05ac28b9d3be0d4f243f851471ba6c0ba90d2e351ba3619b241398883a
font_01_sfnt_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 10988 bytes
SHA-256: 963f5af30b930245b4df943d55821c899dcf4c429b325a9de240d5653d89c2f8
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16272 bytes
SHA-256: b61904ef019f397cd458b7794cfbecdbec4c7817225d8995fedfd75ee73441ba