Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4ec54b4dadfb23…

MALICIOUS

PDF

89.5 KB Created: 2021-04-02 12:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27b59b8ddd2a36e5e95de9309b3462b1 SHA-1: 07fab6c2cc09949b22f82be09c83c2c7eec3e713 SHA-256: fa4ec54b4dadfb23b74c83ae6748f6a60655f833dd47496052b782fb0a4d4936
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or distribute further malicious content. The PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirm this behavior, indicating a high likelihood of malicious intent behind the document's creation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/award?keyword=intoxicacion+por+anticonvulsivantes+pdf PDF link annotation
    • https://cdn.sqhk.co/rifusofuwedi/nEjdijT/college_football_live_streaming_apk.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/62418427286.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/Lichjjf/psoriasis_cream_amazon.pdfIn PDF document text
    • https://wapinabukodinu.weebly.com/uploads/1/3/6/0/136051982/pufovivujawe.pdfIn PDF document text
    • https://sokefumupuzezu.weebly.com/uploads/1/3/5/9/135991751/jalomeki-dunomaxo-wagalukarofulu.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/hUtwatA/specialized_women_s_remix_shoes_review.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/64037988973.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/kakunojunegi-ronegu-busemivebadu-dadalugire.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/my_smoke_detector_keeps_beeping_three_times.pdfIn PDF document text
    • http://xobilosusi.sportsontheweb.net/aptitude_test_sample_questions_answers.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/5dfa4d2e00af5b1.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/kirerafizokesunaraze.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/37673546654.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/gdk7uoH/wowalojijilefako.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/RjehafS/download_fire_sniper_combat_mod_apk.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/3c70ee11-c150-45ec-8db7-e4169956025f/time_management_tips_for_students_during_exams.pdfIn PDF document text
    • http://torejejowomu.myartsonline.com/list_of_adjectives_adverbs_nouns_and_verbs.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/61236159669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5a91e2-32b1-435b-a383-2d738c5c4641/what_was_true_about_the_brown_v._board_of_education_decision.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_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 5216 bytes
SHA-256: bfb8d5259885c66b0832c9abfdf1814bac88af63c8a8f585df1b3e0dc690f174
font_01_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 12692 bytes
SHA-256: 7aafe998d9afd4ca39655a20494757e04d284edcabb57900b25f383509e88501

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