Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9571f3eb06e6f0f…

MALICIOUS

PDF

87.9 KB Created: 2021-03-01 07:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c142eadcac8dbd440dfde420ac44aff5 SHA-1: c46aec8b77e4106dd2b05ab639ff7ea85d9abfbd SHA-256: b9571f3eb06e6f0f53c5220005b48bb89a0570be3b3e20978e40def1560dcf9b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to a book chapter, likely intended to trick users into clicking a malicious link.

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://baarspo.ru/wix?keyword=enduring+vision+chapter+17+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5ff49680bda5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_601e411d85704.pdfIn PDF document text
    • http://purpless.vip/brahmastra_by_ajay_gulati_free_download0xahe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_60377d4033321.pdfIn PDF document text
    • http://all-gopro.com/limebekadisemepipavorrx8k5.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/39443335940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_603ba25bbf1b5.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/what_genre_is_princess_academy.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/georgia_driving_test_answers.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/what_is_process_customer_service.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doxekapop.rf.gd/reading_cvc_words.pdfIn PDF document text
    • http://jomurire.epizy.com/2003_lexus_es300_engine_swap.pdfIn PDF document text
    • http://bejofumojep.rf.gd/wifi_connected_but_no_internet_fix_android.pdfIn PDF document text
    • http://kudibapu.rf.gd/loletitulaf.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/bemupelosidu.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/free_3d_tetris_game_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/gotebirafinevilirog.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/birth_certificate_correction_form_kerala.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_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 5536 bytes
SHA-256: b980f9f9da5f7f220d3ba69f7c4aa0a7ca0669bf406497f810af4a9daf955d41
font_01_sfnt_off00013034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13034 10004 bytes
SHA-256: 39f3040b989fafbcf177cc2b3a04b9ef8f803df738980870728b058b1d397a20

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