Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c90225588b7216…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 10:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1aacb4f1ab55d260fe5964468008ef14 SHA-1: 4ba01c6f4fef2514b16a4dc367eb517cb1cfa44e SHA-256: f1c90225588b7216b884bb14891976e35fedc2aeee7319da1965c71bf32dfc7b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document uses a lure related to visa applications to trick users into clicking embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=adjustment+of+status+form+for+k1+visa PDF link annotation
    • https://cdn.sqhk.co/jobubexivex/gd6gfdg/mexotusewitusi.pdfIn PDF document text
    • http://pornbustyvids.com/clash_of_lights_s4_apk_updateehoxd.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/L9y2ie6/gebodaxidetomujidak.pdfIn PDF document text
    • http://leree6.club/kevezomexetosogaf5m3o.pdfIn PDF document text
    • http://b4shop.icu/nail_salon_near_me_open_tomorrowttsf4.pdfIn PDF document text
    • http://1yamal.space/titid79obc.pdfIn PDF document text
    • http://netewe8.xyz/349440360601hiw1.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/how_to_check_last_call_on_nortel_phone.pdfIn PDF document text
    • http://item-get.top/disigibz92lc.pdfIn PDF document text
    • https://cdn.sqhk.co/lirotigi/a5iagdL/job_card_ka_full_form.pdfIn PDF document text
    • http://wei-nmvc.com/jumubexobodukafopakaf3tjiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/103e06df-b512-4029-875d-dd3694901d4e/sanuruwekiseli.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/mathematics_algebra_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/salut_d_amour_elgar_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/arabic_writing_practice_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fefcd54-c764-4177-bf08-3bf89e1904a0/microsoft_access_tutorial_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b4be54-9495-493e-9cc5-d9ce13635e51/37880984955.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/saxolibaraxoxamaga.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_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 5264 bytes
SHA-256: 974b7a7cdd2eb5ef90a966cfae79819b5451e5d3ec2a8b1523b9f6a1ab5b5266
font_01_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 11452 bytes
SHA-256: 2154259c96776d9a9095ad3f986c997776b4ed9ee4991ea702dd3b421041480b

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