Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d96ba5070ddd394…

MALICIOUS

PDF

96.2 KB Created: 2021-02-26 07:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7f53dbcb2ec88775d468c41f3c3781d4 SHA-1: 08fdfb41d804838ce3793b71d9a2880a764ec890 SHA-256: 8d96ba5070ddd39433e1909481576ea7b3dc8910afed7fdde873fbab11042946
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to potentially malicious domains, disguised as academic or software-related documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://bologen.ru/wix?keyword=ap+physics+2+princeton+review+pdf PDF link annotation
    • http://kamikofonem.mygamesonline.org/how_to_be_successful_special_educator.pdfIn PDF document text
    • http://mybatut.store/power_suit_samusp7hvo.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/jcJJhjl/top_tracks_of_all_time_spotify.pdfIn PDF document text
    • http://lishop.site/huawei_health_app_stopped_workingkggtl.pdfIn PDF document text
    • http://forecast.bet/pisosowobu525td.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/bosch_500_series_dryer_manual.pdfIn PDF document text
    • http://kegujusotuk.iblogger.org/negative_liabilities_in_balance_sheet.pdfIn PDF document text
    • http://zootime.store/kiwarapodaprtx1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxutakizet.epizy.com/sojuxon.pdfIn PDF document text
    • http://tupazovux.epizy.com/players_handbook_dnd_5e_items.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/gizawozofejizunore.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/consumers_energy_report_gas_smell.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/crusader_kings_2_traits_guide.pdfIn PDF document text
    • http://najorenowodume.epizy.com/60281731829.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_off00013a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 5376 bytes
SHA-256: 67cdf935bff8055a3120550e6f7959d24c532d94e3ecf37f6d280f314f86f7c1
font_01_sfnt_off00014c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9F 11316 bytes
SHA-256: 9babe839776d85e470afe3f521c38835a115a29eceada83066d595a338ee922e

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