Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b44ac31d4d9faa…

MALICIOUS

PDF

72.7 KB Created: 2021-02-09 12:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 70667fcada29ae7389300bc996160ab6 SHA-1: 6294e14beb88ac7ef7983276951bcb5f8f71d5f9 SHA-256: f1b44ac31d4d9faa2e3e1a2ab1785a928beb48b2a163d5e4bd4ba2ce75946f79
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting services, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable domains. While no scripts were explicitly extracted, the presence of PDF_URI and EMBEDDED_URL heuristics, combined with the overall malicious verdict, strongly suggests the PDF is designed to redirect users to malicious content.

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://seumenha.ru/123?utm_term=merry+christmas+nativity+pictures PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455377/normal_601d9a0f6bf23.pdfIn PDF document text
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/pizamano.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/zirarume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_6015b84443bf9.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/ba4d584fe06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5ff5ff7821f05.pdfIn PDF document text
    • https://gufuvixenize.weebly.com/uploads/1/3/5/3/135387571/mobinelunefoxo-nifep-dutubagerora-xadofepotofiwus.pdfIn PDF document text
    • http://belkwigs.com/acrobat_reader_11._10_for_windows_79oe53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_6013a496cf14e.pdfIn PDF document text
    • http://shishkin-seed.xyz/ecuaciones_de_movimiento_rectilineo_uniforme5vj49.pdfIn PDF document text
    • http://lightly.store/mold_design_in_solidworkstn39z.pdfIn PDF document text
    • http://opssmall.space/backstreet_boys_ages_nowqoxrq.pdfIn PDF document text
    • http://wordwild-store.com/download_village_and_farm_mod_apk_revdl7nytm.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/3411182.pdfIn PDF document text
    • http://jisijopimif.66ghz.com/vafukavukitajukakutej.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/zagubip/gerund_as_direct_object_worksheet.pdfIn PDF document text
    • http://viwivebobip.epizy.com/mabudenujen.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/vivodorukaf.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 5308 bytes
SHA-256: 226f98d0f8f748ea14b0b190b4043fa5b7c5a232df20b28dd824a4e2075225c9
font_01_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 10432 bytes
SHA-256: 8b4bf4b0866fe0a60f9ff04b210e08b3e9c362e9d702c65bfedf688c2cc1d7f1

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