Malicious PDF — malware analysis report

Static analysis result for SHA-256 f175042c779e19c4…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 20:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8b7778a1b8ea74f90eeab0894f5f2e44 SHA-1: 49a6e9bb2829d5526c6863a3c02771f9fc1beea0 SHA-256: f175042c779e19c4282a0d631947032f083b10d224e6f6610c1d27f4c90127c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('midufefew.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to create a link farm or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://midufefew.ru/award?keyword=revista+boticario+pdf+baixar PDF link annotation
    • https://cdn.sqhk.co/ligumorik/jb6gfjc/caregivers_home_care_rochester_ny.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/70099832445.pdfIn PDF document text
    • https://wewebaviwipi.weebly.com/uploads/1/3/0/7/130775561/344e780.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/vihjfhf/dazumifexo.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/hgUjamm/brand_management_companies_uk.pdfIn PDF document text
    • https://zelegurilu.weebly.com/uploads/1/3/1/3/131380871/5ffbcd5ce2.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/how_to_become_a_prosecutor_attorney.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/emibVig/bugufudenupiwokapinip.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/jakujakula/facebook_messenger_apk_latest_version_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/assoinvoice_convertire_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db96359b-f74d-4c8c-9d12-1e825d4c4b49/psychoeducational_group_topics_for_substance_abuse.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/37555596411.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/8088039095.pdfIn PDF document text
    • http://bitines.myartsonline.com/jiterosukakakigije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f78dd9-46c2-4dc4-98c7-05e7a8aba234/mercury_4000_gen_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/90986873985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8004f82e-a5b8-49c8-93d7-56fdee38a60e/could_the_stock_market_crash_in_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/suxodugufisuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/87164945189.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/54252166167.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/25940455663.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 5392 bytes
SHA-256: 13c41c4d582bbd3fb2927d55c6a1cdf0446ac14c0f83fb4ef803593a9a014796
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 13228 bytes
SHA-256: 39ee484e8112b4893fb968664415479c1b71edb5a4ebff90fa480ede6fde0f42

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