Malicious PDF — malware analysis report

Static analysis result for SHA-256 547ff7b4ba98a2bd…

MALICIOUS

PDF

77.8 KB Created: 2021-03-22 00:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55dfad457a35d7a99b685eeec8a9a781 SHA-1: d1553893930f8decea95d0d64ff82ac251ecd537 SHA-256: 547ff7b4ba98a2bd7be784d5de1922c95ec8b49f8205a2f1b3669abf239e31f6
134 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=anm+form+last+date
    • http://trynon.xyz/balancing_worksheet_1_answer_key30l30.pdf
    • http://poxeget.iblogger.org/lean_business_model_canvas_unfair_advantage.pdf
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/vezawadokotiber.pdf
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff25f973e8dd.pdf
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/271d43b5ded.pdf
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/xigewa-mewekan-bofedamat.pdf
    • https://cdn.sqhk.co/xeloxilava/bHuWVHQ/dragon_city_2013_gameplay.pdf
    • https://cdn.sqhk.co/majumoros/jjgizBE/8216467745.pdf
    • https://cdn-cms.f-static.net/uploads/4486346/normal_603cea295714e.pdf
    • http://fortuneo.biz/mcgill_gpa_scale_20196d729.pdf
    • http://lugogojeradipax.22web.org/74313420158.pdf
    • https://wemogejivaje.weebly.com/uploads/1/3/1/0/131070934/viliradezojew_fuwasofisotij_burexatu.pdf
    • https://cdn-cms.f-static.net/uploads/4379233/normal_6030ac5195821.pdf
    • http://gufutaca5.xyz/above_eleven_sky_bar_bangkok_menufnxz5.pdf
    • https://cdn.sqhk.co/vulovosovem/jcicQln/2305354416.pdf
    • http://smeshnoykir.space/aleister_crowley_el_libro_de_la_leyz6v6j.pdf
    • https://cdn.sqhk.co/tivinarafuvu/BXsicic/full_steam_ahead_meaning_synonym.pdf
    • http://xunajoza.22web.org/art_history_major_university_of_chicago.pdf
    • https://cdn-cms.f-static.net/uploads/4487631/normal_600c9e54cd378.pdf
    • https://cdn-cms.f-static.net/uploads/4366011/normal_60495eb45bc7f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazorixekunafob/razutigibaxejes.pdf
    • https://s3.amazonaws.com/ropidadegaxut/24664395154.pdf
    • https://s3.amazonaws.com/dazemi/65610009920.pdf
    • http://deronug.epizy.com/56536322386.pdf
    • http://gudavipupax.rf.gd/oracle_12c_database_security_best_practices.pdf
    • https://s3.amazonaws.com/nevowimo/kuxedupumimazibide.pdf
    • https://s3.amazonaws.com/suximawo/indian_flag_images_wallpapers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ed.bin
b062e74b1e941e446473e770e39f8feff3921ed423ba998d617900966f25206e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 5040 bytes
font_01_sfnt_off000102f5.bin
4dedecf4d2813fab6248725d64f5ff3f03c60c7772872da85c8fc6ca21a8478d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 11036 bytes

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