Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caa7a43b040145d…

MALICIOUS

PDF

68.1 KB Created: 2021-01-31 15:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: a60c636706a432af2d578dd1431995ab SHA-1: 0bd2da765c3bc62f42ba891e78bd78dd57405965 SHA-256: 6caa7a43b040145d9272eab9f379fd6b00aaa8d334975e0b1ca39afb900f1f19
196 Risk Score

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.
  • 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://jacksth.ru/aws?utm_term=textbook+of+bacteriology+pdf+free PDF link annotation
    • https://cdn.sqhk.co/vavusiwi/fMdjggi/free_movies_and_tv_shows_app_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fe2ca3c95433.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/butujakarenop-dosav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5ff8d69bc039e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_5fffec72da4af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_600bf2c73ae1a.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/nosuluv_widefu_biwudorunin.pdfIn PDF document text
    • https://zuvexege.weebly.com/uploads/1/3/0/8/130814851/9343086.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/ejeEie6/kevonu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fcf9551ac78e.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/gi9Bihl/tiny_planets_theme_song_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/31jeijn/keto_general_tso_chicken_sauce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_600c45323cc57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372358/normal_5ff2dd964bb33.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/ajfDpjc/carnival_city_informally_crossword_clue.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_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 5468 bytes
SHA-256: e992927c49c5313fdd7f00d61eb862bef9554184ebe56b839920118fb16cb597
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10404 bytes
SHA-256: a26b934ca0b3e14b403467b23f25bb656ccbbcebab16821a0e779a36344c79d0

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