Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bae5f1f1845e14e…

MALICIOUS

PDF

73.2 KB Created: 2021-02-24 18:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: af552881f0d85d607363a8a06e4c1d8e SHA-1: 76e084d5057260b527817cb3a60acde58bfdad09 SHA-256: 6bae5f1f1845e14e814f65bf5ee4c6192df65c596cc8b88bddbcafe016b0fa31
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, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to financial credit operations, which is then used to redirect users to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=caracteristicas+de+los+titulos+y+operaciones+de+credito PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500208/normal_602f79eccb25f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_60014b75c9f74.pdfIn PDF document text
    • http://pixell.store/2017_physicians_desk_reference_71st_edition7gzjr.pdfIn PDF document text
    • http://healthit.space/space_marshals_game_walkthrougha9dmc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd9ce41e895b.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/how_many_books_are_there_in_total_in_the_catholic_bible.pdfIn PDF document text
    • https://pulavirovedozas.weebly.com/uploads/1/3/2/6/132695401/265bde30d6bccf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_60269f27dbcaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/Z2tyPRl/56308456129.pdfIn PDF document text
    • https://xoxatujetila.weebly.com/uploads/1/3/0/7/130775098/7029949.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/22554281173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_6016bf4008016.pdfIn PDF document text
    • http://crispyset.online/piriform_ccleaner_name_and_license_keyzgfd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_6015d1723bf36.pdfIn PDF document text
    • http://leledup.mypressonline.com/debiz.pdfIn PDF document text
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/a14ff4d6e.pdfIn PDF document text
    • http://f1l3download.site/new_house_building_checklistyyg48.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/why_is_my_tv_screen_have_lines.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/ahiHhe4/67314534744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 5072 bytes
SHA-256: baef52a4aecdc31dfea5a6b55c7e8c18df34b939c36a5e90a656ea8c96f8661b
font_01_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 11836 bytes
SHA-256: 728ed9e076180f6dc0070394bebee454717495b39fa1e9db2b5ab7a3fe0317ed

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