Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f56e4d86730182…

MALICIOUS

PDF

71.2 KB Created: 2021-02-09 10:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 6ba7c503940b05ad9837cd4405b6a968 SHA-1: a695cf2593f19528983faadc0cf26bdcb8635a4b SHA-256: a1f56e4d86730182d8937483d1b3b46d529dd4ea60f529bf37419ce25b50953a
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://bologen.ru/123?utm_term=theory+of+work+adjustment PDF link annotation
    • https://cdn.sqhk.co/datolabevev/XgemEhi/58556563577.pdfIn PDF document text
    • https://cdn.sqhk.co/mefomixut/FiaCnTA/25727257468.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/gjidjfx/25861474622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476595/normal_5fc6ce17e06e7.pdfIn PDF document text
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/6228469.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/kotodur/71694800261.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/zimororowalurazebosatam.pdfIn PDF document text
    • http://godawawisegi.epizy.com/gedufejurimugadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/kivotunuleti.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/crystal_reports_totext_without_comma.pdfIn PDF document text
    • http://supabusoto.rf.gd/mujofesi.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/kampala_international_university_application_forms.pdfIn PDF document text
    • http://ganesuk.epizy.com/fnma_underwriting_guidelines_for_student_loans.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/20073562189.pdfIn PDF document text
    • http://zunebafovako.epizy.com/bali_road_map.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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 5396 bytes
SHA-256: d0c9fcc35ddcaf32d1df5377a75ca595d499ac0729cc96ca1080b7d77068ec01
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 10560 bytes
SHA-256: ea743dfaff7eae27d3f22fbdfb4cdb83198a946fae61c705c9f2e1a8e8726a2e