Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b156cb984d5741…

MALICIOUS

PDF

77.9 KB Created: 2021-04-05 08:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f0524ce6ece29cad3d856e5b3018b2a7 SHA-1: dfc9c565a70e7174ca04b37ba4a57dca61a0e5b6 SHA-256: 41b156cb984d5741d906d0e1816b4783fbb646449731e7588e44f92f49131376
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and one specifically using a 'keyword' parameter suggesting a search-engine optimization lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/wix?keyword=dream+piano+mod+apk PDF link annotation
    • http://kanshoper.site/what_bobbin_does_singer_4423_use7r1ke.pdfIn PDF document text
    • http://bloodcraft.online/lepefevumelt7psj.pdfIn PDF document text
    • http://maxirem.mygamesonline.org/arbitrase_syariah.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/pisekalujisejo.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/thank_you_lord_for_loving_me_hymn_lyrics.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/74437995537.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/kiss_the_rain_ukulele_tab.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/bukak_nikixirakoza_pidokisozevude.pdfIn PDF document text
    • http://erogan-oficial.site/3529887751fap2r.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/what_is_the_average_soldier_salary.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/bank_exam_study_materials_free_download.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/what_if_you_run_out_of_cards_in_monopoly_deal.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/nelugix.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/bibaxasavojamosete.pdfIn PDF document text
    • http://wewofif.scienceontheweb.net/pesoganatopomukuvage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gerinaselamezos.rf.gd/66523820486.pdfIn PDF document text
    • http://fafalibowadavuz.rf.gd/dog_tales_rescue_episode_guide.pdfIn PDF document text
    • http://vabizawez.epizy.com/the_ruby_on_rails_tutorial_6th_ed._download.pdfIn PDF document text
    • http://wuzazuj.rf.gd/39248804890.pdfIn PDF document text
    • http://litorow.myartsonline.com/46974766396.pdfIn PDF document text
    • http://budaxixew.epizy.com/jasodijiborerisaf.pdfIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/adobe_premiere_pro_2015_specs.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_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 4960 bytes
SHA-256: 9b2d837e41a9eab6a9848eab2ff3938ec4ffaa49afc4540188d26eda977e0eb4
font_01_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 10616 bytes
SHA-256: 89e57caf38f615e11451def122a933b220b9e6980ff7b905b563d9e444555a21

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