Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec7421f63d85e5e…

MALICIOUS

PDF

110.1 KB Created: 2021-03-25 16:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0c5e3b464041b648ffd30005ceaa1fde SHA-1: 5a08a7e2af17d97a0a029e90dda2d3c76da4c3c3 SHA-256: 2ec7421f63d85e5e468556c463fe844dd04a6505d3a86d04fe7d78460a1d5738
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, hence the inclusion of T1059.007.

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
  • 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://fokemale.ru/award?keyword=anterograde+tomorrow+kaisoo+pdf PDF link annotation
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/6f7498.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/4_digit_addition_word_problems.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/grohe_tap_hose_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/ieChggi/cosmos_neil_degrasse_tyson_netflix.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/50badd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_601987ecc5b84.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/jeJnhIp/how_to_get_smithsonian_channel_on_apple_tv.pdfIn PDF document text
    • https://bevoparekev.weebly.com/uploads/1/3/4/0/134018333/a77dc65e7.pdfIn PDF document text
    • https://lodofimedama.weebly.com/uploads/1/3/4/3/134327961/e5d36f.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/lupifukasepu.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/how_to_change_installer_code_dsc_impassa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5fcf87304733f.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/zerepuzuze/free_responsive_website_templates_using_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/65520821147.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/buffalo_enco_rice_cooker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/xiwojuzuku.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/13174276469.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/84600835311.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/mewabugifumuligika.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/power_electronics_jobs_in_houston_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/free_islamic_books_in_bangla.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_off000165a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A3 5476 bytes
SHA-256: 6a7367099b7ee622ee7e14ecfea3875a8754bd71c262ef03786a11aa7bfd8f34
font_01_sfnt_off00017845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17845 23292 bytes
SHA-256: c61551ad86824498e3f3075351f345b54ef6a79e24e209b5c8b48a23aa6a8613

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