Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c682ed80c7fce…

MALICIOUS

PDF

78.7 KB Created: 2021-03-07 23:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e4b3e5a8b67db1917c6b2efafc487b9a SHA-1: f20f2f2423fe37f3c9698a3b0d79190e38172326 SHA-256: d36c682ed80c7fce943aef798615d15b45943966c0087a6dac5eb7c87199968e
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous external URIs, with a primary focus on the URL 'https://jottigo.ru/strik?utm_term=bodyweight+fitness+biceps', suggesting a phishing or redirection attempt. The presence of embedded URLs and the nature of the heuristics point towards a phishing attack leveraging a lure related to fitness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=bodyweight+fitness+biceps PDF link annotation
    • https://cdn.sqhk.co/remigalakefo/i37l3v3/crowdstrike_stock_price_target.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_5fdc038e5dbab.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/6jdb8ie/18150235142.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/haxVrhf/jidunipomigav.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/75455776868.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413564/normal_5ff3fea740804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_60274a58a8206.pdfIn PDF document text
    • http://penageli.getenjoyment.net/manual_d-link_dir-605l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_603ea4116afac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dbaec1-09a3-4c64-82e7-e9557feee3bc/dunkin_frozen_caramel_coffee_calories.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_311528bc1e9349c5824427c096da6672.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/mac_catalina_slow_performance.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_8197788b6469484f8fe221646d05e7d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9ea2a5-51b5-4880-9788-6766ad1a723a/damusatesesadefi.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/conflict_of_interest_policy_nonprofit_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/direct_and_inverse_proportion_word_problems_worksheet.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_38af8be5676c4a22b139587829308b20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/31704318723.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_60fe284480c14600b451cb1074006419.pdf?index=trueIn 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_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 5464 bytes
SHA-256: 903cafddd69d043202449f6449f9358c007520bee033cbfdf1f7bd0b5d5d78fc
font_01_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 10896 bytes
SHA-256: 67de6fd17340efef53945d3d79395adc0642eb60002c72dfa8c5cc652f471ed7

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