Malicious PDF — malware analysis report

Static analysis result for SHA-256 70999dac2bd68227…

MALICIOUS

PDF

84.7 KB Created: 2021-01-25 16:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3606882a2e97ad285a755d0e74379327 SHA-1: 2f1b0ec698e5ce2e6b2c7164fad2fb2ed7bd942b SHA-256: 70999dac2bd68227103b93972c98ea378a75e0ab6d298b919df08304be5aeeb1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics indicating it redirects to known malicious infrastructure and functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=bus+map+bangkok+pdf In PDF document text
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/911703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_600d8f62b99f1.pdfIn PDF document text
    • https://podisubegipuvu.weebly.com/uploads/1/3/0/7/130739029/1333680.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/gejogopejaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/igG9zbc/free_streaming_nfl_games_today.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5feb213fded37.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuwizatag/gfPhcf1/euro_train_simulator_2_hack_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451231/normal_60045d9830e9b.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/ha73Mia/the_legacy_golf_club_norwalk_ia_50211.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/0c43ca404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://buxidogekalor.rf.gd/queen_storage_platform_bed_sale.pdfIn PDF document text
    • http://mujopoweter.rf.gd/contributory_factors_to_reported_road_accidents_2017.pdfIn PDF document text
    • http://dixuzudes.epizy.com/egyptian_cotton_sheets_3000_thread_count.pdfIn PDF document text
    • http://suzebotazolonav.epizy.com/reporters_episode_105.pdfIn PDF document text
    • http://mumeriladokovot.epizy.com/31506249653.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 2980 bytes
SHA-256: 3d33cce3d7c11f75b04885c72d98ce230a0dfeddfc39b5db833c3806d659f8d8
font_01_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 5484 bytes
SHA-256: 290f33865da94f6d75e63c2c6cd2b5cb5896b9cf16ac364bc1ae055e7acede0e
font_02_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 6756 bytes
SHA-256: 2045187f82f4a0e32a28ad26eef1113b599d719295ba78f9364835a8424e907f
font_03_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 11464 bytes
SHA-256: 3c8bf3c14625c0a871e4b8f9197862e0e6aeab5799d6b6b54b29f4fd17eedd85

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