Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ca7b548808b027…

MALICIOUS

PDF

71.8 KB Created: 2021-02-03 11:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 0f7ed0e8d6e250d0588c8a54d6be931e SHA-1: c10aa96f15ab5d960562b059513a6d1688f4fc29 SHA-256: a2ca7b548808b0270b118c9184accfa8e35fba5925904d3a1c2775b1a77c2cb4
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=assembly+language+pdf+notes PDF link annotation
    • https://cdn.sqhk.co/rufadexu/dsjtgf6/amazon_gutschein_fur_kindle_bucher_einlosen.pdfIn PDF document text
    • https://cdn.sqhk.co/dogojaseziwo/aJeUiei/little_big_city_2_cheats_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/gwYgfgf/mumero.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ayiibXm/break_time_providence_columbia_mo.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/jidjWhj/naket.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/jhmhbnj/78297112262.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/ie5ja3t/lobatepufulafeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/INjgbjd/bitojedinofekiluwuzefe.pdfIn PDF document text
    • https://ruxibotululag.weebly.com/uploads/1/3/1/4/131408142/nefurerefir.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/gcifgjl/32513785903.pdfIn PDF document text
    • http://wetepuzasuvuroz.22web.org/free_cloze_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvojifexuf.epizy.com/gasefo.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/los_adjetivos_posesivos_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/siwoxidaditurux.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/best_app_for_whatsapp_status.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_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 5496 bytes
SHA-256: 0c1f4b57c267f516d5caf5ef5c852edc92ad8294e4053315f656176a1e533d90
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10552 bytes
SHA-256: c7bca7980696a7714e7a23427dd7476d4b988ce4ea92eec75355057cd9b5e58c