Malicious PDF — malware analysis report

Static analysis result for SHA-256 61471e26bea4d311…

MALICIOUS

PDF

74.2 KB Created: 2021-03-14 15:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 87e4ca63d3e35274bcca17588021b4da SHA-1: 234a859065451d80885390666281e24e17f02aaf SHA-256: 61471e26bea4d31163cfa7e4f8dd22da51cc91345421e643a5a9d717a99e9e6e
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or phishing lure. The primary URL, 'https://golowaki.ru/wix?keyword=circle+graph+worksheet+pdf', is identified as a redirector for a 'free-download phishing' scheme. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/wix?keyword=circle+graph+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/kufejagefep/hghjDgi/metal_shooting_action_games_download.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/what_does_gregor_samsa_transformation_symbolize.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/texumilujinoxobijum.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/E31Cjhb/teachers_pay_teachers_login_and_password_free.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/bopatazovavidogumixilas.pdfIn PDF document text
    • https://fagedudadisex.weebly.com/uploads/1/3/0/8/130874641/farumadura_rewevudijen_tawaba.pdfIn PDF document text
    • https://botugesoxa.weebly.com/uploads/1/3/4/5/134509905/8519253.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/crigVjf/9830143577.pdfIn PDF document text
    • https://vobudogekatobef.weebly.com/uploads/1/3/0/8/130874620/5467473.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/tawosutosuxi/42837561909.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/ffxiv_garuda_extreme_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/vorixosebogazomufal.pdfIn PDF document text
    • http://bonizeza.epizy.com/wexudavapurotederu.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/lagu_missing_you_btob_matikiri.pdfIn PDF document text
    • http://benepuru.epizy.com/redis_for_windows_7.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_74ea493191df4811985bbc444591c332.pdf?index=trueIn PDF document text
    • http://vilusosexar.epizy.com/dyson_dc16_animal_battery.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_50d7ce8aff8a499080d5c98a9f574552.pdf?index=trueIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_2a42eb0c5ce64554b491f330cb096332.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_6ec1b3cc7b224804892fdf454dad7e2b.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5476 bytes
SHA-256: 365ce3d4e15414b240a8fcad4f0ab9a0289aaea2f8a5097302aef3527fa2f22e
font_01_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 11008 bytes
SHA-256: c3a2cd8211a99a68ee69b5dfb75dd7de4f0e3df2b534db7a37ce4aca5fed533b

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