Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f33902b8c55942…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 03:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a748e549a73f55e568fee505a8d26fe0 SHA-1: 1494b827c1674a8010d461bb379c5bdcaad88b30 SHA-256: e3f33902b8c559429c954af5cdd6b70cf269fbf967a7c35ce8dd8d82f28a855f
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=apk+file+on+ios In PDF document text
    • http://pusokum.66ghz.com/troy_bilt_squall_210_will_not_start.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_603aafa0e6076.pdfIn PDF document text
    • http://zuxegesa.iblogger.org/84467733020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_603bf89b4737d.pdfIn PDF document text
    • http://paxabak.mypressonline.com/36105360805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5fcb9cff6719a.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/arris_modem_login_dg860a.pdfIn PDF document text
    • http://heymama.store/free_bismillah_khan_sanai_musicjrfse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_602d729fc044c.pdfIn PDF document text
    • http://fitdieta.com/47848793407kr5si.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/density_calculations_practice_worksheet_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fcfb32f61d15.pdfIn PDF document text
    • http://twoup-viktoria.online/1997_honda_civic_ex_transmission_fluidkmm28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minegavanifur.rf.gd/free_minister_ordination_certificate_template.pdfIn PDF document text
    • http://kizaseridofe.rf.gd/asepsis_and_infection_control.pdfIn PDF document text
    • http://xodijab.epizy.com/79559091566.pdfIn PDF document text
    • http://lesasesodimavun.epizy.com/48000819836.pdfIn PDF document text
    • http://tebokemirutexus.rf.gd/niganunu.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/free_lagu_hanya_rindu_andmesh.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/jonijilagafiledoj.pdfIn PDF document text
    • http://rasezufolob.rf.gd/suxuvenukamoledanizo.pdfIn PDF document text
    • http://lusalelafujijo.epizy.com/difage.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_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 4640 bytes
SHA-256: 48b96238341304b9512ed4ca6d5c7bdf4b0116a0a3e8d5705f298ff867eda961
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 10772 bytes
SHA-256: 8e9f2ab3ac7a9fdbf7bed5c8a58c41112c043a7cba1094563886e0bf6f07ace8

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