Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfc9b45b6dcf26d…

MALICIOUS

PDF

80.3 KB Created: 2021-01-29 02:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76ce31d32989a4561d94cbea1b80bff3 SHA-1: e998ec5f52c5fa6ab5208c8ef52aec65673443f1 SHA-256: 1dfc9b45b6dcf26d95da48b521450f2bb422b85ae539633a4dc887c98e0dd83a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are presented as a link farm for downloading free applications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wb?keyword=kill%20shot%20bravo%20free%20app PDF link annotation
    • http://tapuxuwurumar.22web.org/jimalugobewavavowu.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/dosozifaboje.pdfIn PDF document text
    • http://jovaguduretup.22web.org/affidavit_of_support_and_guarantee_form_dubai.pdfIn PDF document text
    • http://dobujebenebif.66ghz.com/12071876420.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/85ihTji/88807333231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_60040ea31db76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418369/normal_5fcd6491a66e4.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/fsgmJia/tipurevanelajedodonitinok.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/9f91ce8bca055e7.pdfIn PDF document text
    • http://palifagumelu.22web.org/susilinetamijuwesas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fd6636cf1063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472763/normal_60034a81b82c7.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/limuvabogugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_5fd17d5736724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://derekage.epizy.com/14768879093.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/platform_revolution_ebook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/intake_and_output_sheet.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/nibiz.pdfIn PDF document text
    • http://fitimulosegi.epizy.com/tuxatababo.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/ledazeritekelumuvelulomol.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/free_genogram_template_social_work.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/ksbw_traffic_reporter.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_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 5156 bytes
SHA-256: e703693a3eb8575b8f806956f7c7f84255680f3d61187cfa2392587cb6952062
font_01_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 11664 bytes
SHA-256: b5fbb4f8bed9e148bdcea8fb379fe7a3e9eb923249f2611ef078074bfad42b2b

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