Malicious PDF — malware analysis report

Static analysis result for SHA-256 174baf40153f81da…

MALICIOUS

PDF

135.4 KB Created: 2021-04-07 07:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7a648dbbd3cdcb5dbf366a143bf543e5 SHA-1: 21c4aa383bc9a0bfa08d64a2afb81ae5b5597a57 SHA-256: 174baf40153f81da755607884ee76f8bb9ccd7946aee4409d1c01ff020df1228
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=plan+de+estudios+2011+primaria+sexto+grado+matematicas PDF link annotation
    • http://sdfsdfsdf.shaketorch.com/kilebepipejameboxajezi.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/7rZEhe9/simple_keyboard_android_apk.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/d7a2a437d.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/96004778839.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/newad.pdfIn PDF document text
    • https://kozewililusu.weebly.com/uploads/1/3/4/0/134013002/6615199.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/lugenijiw_sisiwiza_xidejedejipamin_jodixob.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/86732768787.pdfIn PDF document text
    • https://cdn.sqhk.co/riduwadanu/iWhifhb/zetenes.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/35981515246.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/LVhj3hb/moral_character_development.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/fOxjdX0/to_do_list_and_notes_app.pdfIn PDF document text
    • http://fibaratibe.22web.org/89339978524.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/c451ff4a-c24a-404b-a4e2-2f69ef956d99/porsche_cayman_gt4_owners_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f938238-29c1-4f6e-88ff-bbba4889879c/java_8_stream_api_map_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47bbf3f-ff67-4b1b-9689-ea624b948533/ranodukuladus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f086822f-e93f-42c5-905b-bcfb5deece93/95283069666.pdfIn PDF document text
    • http://movuzawizigevej.myartsonline.com/3d_printing_understanding_additive_manufacturing.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/smooth_muscle_contraction_steps.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_off0001d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0E8 5788 bytes
SHA-256: 721951fd76562c21b9f433262811edb4fec7114e060a5ea7840887ff359c6cad
font_01_sfnt_off0001e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E497 12696 bytes
SHA-256: 610faac0807ab3876b6c725e35723abfda434d0d6b3e0ca8880a6cd20e46bc59

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