Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f062e4a9c15c50…

MALICIOUS

PDF

76.4 KB Created: 2021-03-16 18:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e69274e704bc70cc83ca8302c7f50cb5 SHA-1: 7c82d6bc74905e8dd8f2a10b9d730896dc911227 SHA-256: c6f062e4a9c15c50892e3815c893204e9f8a437f53ee75dad42554c3d34a93b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs pointing to disposable domains, suggesting a phishing or link-farming attempt. The presence of these numerous external links, many on suspicious domains, strongly indicates an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=how+do+i+adjust+the+temperature+on+my+rv+water+heater PDF link annotation
    • http://streamsweets.com/easy_ice_cream_recipe_without_machinellas2.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/82535907059.pdfIn PDF document text
    • http://axecheat5.xyz/fuvebefobeu5.pdfIn PDF document text
    • http://bossyonlinex.com/fluke_1507_price_ukdtnpv.pdfIn PDF document text
    • http://golden-charm.ru/793560821258er0j.pdfIn PDF document text
    • https://cdn.sqhk.co/gokovolasula/3dhfpia/36028140229.pdfIn PDF document text
    • http://tosety.xyz/38203916056icr21.pdfIn PDF document text
    • http://simultaneously.space/medical_anthropology_and_sociologygbsp9.pdfIn PDF document text
    • http://dazavaluk.mygamesonline.org/budaya_kerja_perusahaan.pdfIn PDF document text
    • http://zdsshop.top/how_to_write_a_personal_narrative_essay_for_high_school26j8y.pdfIn PDF document text
    • http://upgrade4me.com/75759611925kjyqn.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/azotemia_e_uremia.pdfIn PDF document text
    • https://cdn.sqhk.co/fefoseto/jAvUwib/indeed_job_search_appleton_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/Ugeiehi/52429675068.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/iplsgeN/92699853788.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/70d83b13-4860-4b8b-b933-3e59838dd5ac/24944444255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59839ac7-1ad2-425b-bcfa-3b411099a2a3/quote_for_new_journey_in_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85e989f-6762-4295-a85c-6e83ad13f9d3/how_to_program_ge_universal_remote_to_vizio_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1fc196-8966-4a10-bba4-8c2eb21ca465/57262602915.pdfIn PDF document text
    • http://fomepufasele.atwebpages.com/barthel_score.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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 5456 bytes
SHA-256: 7cdbff8f64c58e157a69169467891fe67b9dc95168e64616fbfc54599a62de11
font_01_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 11256 bytes
SHA-256: c75144af496e07771ac8ecf2512d6cf6e6f45e0b8d2690789cd1447fa3e838e7

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