Malicious PDF — malware analysis report

Static analysis result for SHA-256 a838b99e22891634…

MALICIOUS

PDF

81.5 KB Created: 2021-03-06 21:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b96bb6aaf799058a290dd0737a2abdae SHA-1: 877a1540a4c8b1943d46a5e1373411759e4caa6b SHA-256: a838b99e228916349772f26b431bdd657e288047610e2e517b1c11a0cfc8c61e
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and numerous URLs suggest an attempt to redirect users to malicious content.

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://baarspo.ru/strik?utm_term=how+much+is+my+new+home+sewing+machine+worth PDF link annotation
    • http://fumuroruzej.medianewsonline.com/how_to_connect_hp_2544_to_wireless_network.pdfIn PDF document text
    • http://citrus-fruit.space/sinatevezapemlhgs6.pdfIn PDF document text
    • http://pixelbarista.com/foscam_fi8910w_power_supplyftk43.pdfIn PDF document text
    • http://hookup673.site/kiki_s_delivery_service_sheet_music_orchestrayj54d.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/ranco_fridge_thermostat_adjustment.pdfIn PDF document text
    • http://flipping-car.online/javemixagazerfdqv.pdfIn PDF document text
    • http://registrat.space/34021098411b1pb.pdfIn PDF document text
    • http://sovetnik53.ru/how_to_service_lg_portable_air_conditioner37e9r.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/39748883904.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/walmart_albert_pike_hot_springs_arkansas_phone_number.pdfIn PDF document text
    • http://marinarus.space/86865117761rejti.pdfIn PDF document text
    • http://instahelpforbusiness.com/que_significa_tener_granitos_en_el_glandertwd6.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/25702980227.pdfIn PDF document text
    • http://idealica-co.site/android_create_symlink_without_rootstuu8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://soranodabiwegi.myartsonline.com/mewolugudaxojexonukizifo.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/gawibo.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_8cad55a7e8e44e288a164b2b29cac27d.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_3b2a89e7c25f4ca6b841ddc0359193f3.pdf?index=trueIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_25d25f01a58445c08c6d6ff0140a2c55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a35f782-1f71-4f97-a931-c94a575e686a/12358649297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c8a193-8dfd-4373-ae41-c1fe91999b55/how_to_pair_jbl_bluetooth_speaker_to_alexa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5220 bytes
SHA-256: 13c97a60ec63426e5461e78e2b1976f7eb0260658427b38c8f489eabea58d9bb
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 10964 bytes
SHA-256: 135c1338214b9890651ad76532881f798d75fa1e4ff3ff4b554d093174e2e64f
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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