Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a1d4b2ba7d37ff…

MALICIOUS

PDF

83.5 KB Created: 2021-03-14 03:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b005e55476c7311e6f903f471b56bb8c SHA-1: 95d8cea8c582b9f50e14dc23f8bbaa167f0a6783 SHA-256: 25a1d4b2ba7d37ffa5bb376ec6a096fc3a37f93309bb0315d6fc79ccb0c126cc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=how+to+work+out+a+rolling+offset PDF link annotation
    • https://cdn.sqhk.co/wadupaxi/iShgjTc/34494015280.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/german_adjective_endings_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/C2ZggRX/moto_g_power_qi_charging.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/iaWigid/versatile_in_a_sentence_for_a_kid.pdfIn PDF document text
    • https://cdn.sqhk.co/nafusomo/inq786c/zombie_gunfire_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/k0jfWgf/sims_mobile_cheats_iphone_2019.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/adeste_fideles.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/gfiFXPv/apple_music_vs_spotify_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/3hdROqZ/nefejuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://gafodix.myartsonline.com/jedatowokofafijepesid.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_342f6708b291449c87a43942880c49ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekojulog/10th_class_result_2019_app.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/rival_ice_cream_maker_walmart.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/what_country_is_the_sun_rising_in_right_now.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/26124839105.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_605753e71bfb4617b6205be221729cc3.pdf?index=trueIn PDF document text
    • http://pewubep.rf.gd/jayco_pop_up_camper_parts_diagram.pdfIn PDF document text
    • http://vekamujibatebig.rf.gd/bird_with_yellow_feet_and_red_beak.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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5052 bytes
SHA-256: 0b5ce4578577ffa50045a537c07e5c50dc34b8ef839a98ef8fae604a1f739bd0
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 11268 bytes
SHA-256: 5c6624267191f49235a92f7068f4163a5d089561c179ecc8e4aa4cee303b030e
font_02_sfnt_off00012214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 9916 bytes
SHA-256: 5f61df7c2c40e65a73e7baab415ae3870048b48487cf6506887db09538f5491c

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