Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac99e6cc3449066d…

MALICIOUS

PDF

66.3 KB Created: 2021-03-01 19:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a31d2e9e4d927156c72d1134514a99df SHA-1: 5c1cc0b678416774f346bec5624c6125dbc3db01 SHA-256: ac99e6cc3449066d29aec28a2f6cbd03dfc5a986ace30893e4ebd236b448151a
256 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/zaviwimewevovek.pdf.
  • 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://zajinet.ru/wix?keyword=bro4-+lewis+structure PDF link annotation
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/zaviwimewevovek.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/gadanilasuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_602505f3908c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_6000560caf266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fe294e51bdb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_603183d32340e.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/fuwawibu/spiderman_old_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/aronchupa_video_songs_free.pdfIn PDF document text
    • http://xotexipu.rf.gd/pavefoziri.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/rugojitorexodo.pdfIn PDF document text
    • http://lawurukipajuxe.rf.gd/whatsapp_app_apk_2019.pdfIn PDF document text
    • http://wesawujejo.epizy.com/samakidazu.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/easter_comprehension_worksheets_for_2nd_grade.pdfIn PDF document text
    • http://fixobijuruloluk.rf.gd/37504869483.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/xfinity_internet_plans_performance_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/gevul.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/kendrick_lamar_swimming_pool_music_video.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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 4844 bytes
SHA-256: cfdb48a4dd2f593d84a2ff81015ab6696375fe1e3b2ca46a49b31bfa4c5ac042
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 10508 bytes
SHA-256: f76de1b99737c7acf1f57617557c5fad54e994b29697bab7f895503e7f6eec8f

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