Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c417c0814933e31…

MALICIOUS

PDF

77.9 KB Created: 2021-03-25 10:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 35d9dd01d1ebfdd6ab514607c99f5312 SHA-1: 2119903c671d4768cc086e076300da99f9e1efdc SHA-256: 1c417c0814933e3105846669a8793942f99f5f8f597c116a9342c06d7096567d
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one specific URL is flagged as a potential phishing or malware lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, and 'SE_URGENCY_LURE' suggests a pretext for user interaction. While no scripts were extracted, the presence of numerous external links and the ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/strik?utm_term=what+verizon+phones+are+compatible+with+straight+talk PDF link annotation
    • https://vinozesuwoda.weebly.com/uploads/1/3/4/6/134685541/teladelam_desotuzebef.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/jadusiduxuwon_teweluz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/besufinaliduvogimaka.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/lcm_and_gcf_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/latest_android_update_for_samsung_note_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c008040-5e72-4982-9b58-fad060e619a8/sandisk_clip_jam_rockbox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5e4dd9-7dd0-4450-a2c3-01eb9e4c9c73/best_indian_cookbook_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06dd8dac-e5bb-431e-baa5-58d774e58cd3/45341655440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5988b551-51df-4e61-8fdb-602e181fadb0/sat_scores_2020_college_board.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_1144458e4f634643a25f8da7b403be78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2583de-e836-4dc2-a4fb-2f319c27a963/fosugipepuvikemoduwade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4bfe13f-04a4-4449-9aaa-2690ab3e80ca/lomoganovagido.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/bhojpuri_devi_geet_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e748a6e2-6835-4927-8a73-ca5908ba172a/writing_lab_reports_for_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adee0b87-6453-4995-b185-be24606d411e/jupolepaxufunuguk.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/how_does_briggs_and_stratton_carburetor_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c04bf3-26a7-4949-a119-4e4a7170f534/5096858063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61ce8ad-dca6-4b8c-8951-8935c6f921df/historia_natural_de_la_enfermedad_diabetes_mellitus_tipo_1.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_8436166034a8463ab60fb326b41a062e.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_634931984d544e7283a725a1829e3388.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_cb50fc0146fd47e1add25766143274a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5e8e4f-2c9b-41bb-aa48-a68df53e3ab6/77150337630.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_c4502545a1874b14974f1fab9e63cc09.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_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 5768 bytes
SHA-256: c5fddaa2cd570172e53e480ddddf69826d96d8d12e465fa4ec2e23e1b34cbe53
font_01_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10992 bytes
SHA-256: d9500e7f3ebb20c3a66421c0d72606eac225b619b90481908bdef15e7af91f58