Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a105af94f3b5eb…

MALICIOUS

PDF

168.9 KB Created: 2021-02-20 04:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31144e8bcba334fe66996fba19b2dea1 SHA-1: 6bdf5ff37449079283c82d443204a51fb6e2162a SHA-256: f1a105af94f3b5eb7460d38ffa0ac1af2c01df556aa9e1315312ded3aaadc76d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to a 'Keystone pipeline status 2020 map' and game download links, likely serving as lures to trick users into visiting the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=keystone+pipeline+status+2020+map PDF link annotation
    • https://cdn.sqhk.co/movumatoz/eHQfiaO/metal_soldiers_2_mod_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/hija4ip/real_steel_world_3d_robot_boxing_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/igIGEkC/66652915986.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5ff5b556c606f.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/gDhgNGt/nosavadaduma.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/nibia4m/naxidobuke.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/cr4gdig/11335891738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_6009b3a1a6a75.pdfIn PDF document text
    • http://lixufejogesapu.22web.org/46945882559.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/ijKgjjd/bubble_guppies_dragon_n_roses_dailymotion.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/iihg4jb/dragon_live_wallpaper_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/ahejeCJ/hakuoki_kyoto_winds_wikipedia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_6021630ec12b6.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/lyjdhgl/epic_conquest_2_story.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/iayiiA9/calculate_percentage_between_two_numbers_c.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/i7yxha9/electronic_project_kits_for_students.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozugafunu.epizy.com/aida64_windows_7_64_bit.pdfIn PDF document text
    • http://nosunep.epizy.com/java_jdk_for_mac.pdfIn PDF document text
    • http://dupodege.rf.gd/sigamabu.pdfIn PDF document text
    • http://rovuritag.rf.gd/zedunutiseluxojusat.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_off00025c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C3C 5216 bytes
SHA-256: b273a509bc6aacc0fb478ddfec1e27b7f2f18ff82d5aa0d7fd54068e21c8ed02
font_01_sfnt_off00026dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DFB 11720 bytes
SHA-256: 3b74fcd194fa6542beec5ed76b05be702a2ae434d741dde410e534a080933737

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