Malicious PDF — malware analysis report

Static analysis result for SHA-256 402b556d808de194…

MALICIOUS

PDF

75.8 KB Created: 2021-04-06 06:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9d51373b6df92d6b7c05e6ec51d5b3ed SHA-1: 88f4e9c8f1910457eab4b1ebdb37021fa2f3f2c5 SHA-256: 402b556d808de194384f0e124533760a676ede2fe9ab5db3e608234121608e51
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/strik?utm_term=are+the+after+books+still+on+wattpad PDF link annotation
    • https://cdn.sqhk.co/jugomuzuteb/ifhcjaK/spelling_mastery_level_e_student_workbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_60234367db97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_603e75bb8ff41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_603cbe882e4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_6025e5a7f0c0b.pdfIn PDF document text
    • http://turoxolu.iblogger.org/17694552150.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/hjMiecB/fluxx_grantseeker_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/bhe3EIF/virtual_new_testament.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_60059485a0db0.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/bgermJD/warplanes_ww2_dogfight_all_planes_unlocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5fc7af3830cc7.pdfIn PDF document text
    • http://rutonujak.iblogger.org/spoken_english_conversation_mp3_audio_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasunuvelew.epizy.com/dandy_warhols_welcome_to_the_monkey_house_lyrics.pdfIn PDF document text
    • http://rokopive.epizy.com/1000_accords_pour_guitare_gratuit.pdfIn PDF document text
    • http://kokomato.epizy.com/sakeripebupiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0f5381-980b-41a4-9d1d-54dbffb36cf5/voxetebirepifibogibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59352cd4-c7d3-4da0-bb94-00ff72d9f33e/garmin_920xt_black_silver_band.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbc405c-37a7-437e-a7bb-1ece0686f034/elgato_hd60_software.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5412 bytes
SHA-256: 0ea858c835236475f8a8ddc64c55b2f8fef60850593e822ecd49e521b2028108
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 10980 bytes
SHA-256: 49345211d8a0fdb1be7b972667e3282d673a53032f21084e6a5fea48badb6be1

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