Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2c58da53734852…

MALICIOUS

PDF

80.6 KB Created: 2021-03-31 01:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 79afa3dee489da33bed34030262d55ed SHA-1: 527fcffadb62c016ad280c693ca401e5f6785b5a SHA-256: 4a2c58da537348529467d055fc78fbb8c132914ad560d4e4c9e6f217e84d8f68
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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://ponafet.ru/123?utm_term=nutritional+anthropology+books+pdf PDF link annotation
    • http://topepuxabi.iblogger.org/folabonazagokotonafubobu.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/bavinck_our_reasonable_faith.pdfIn PDF document text
    • http://pumesuj.iblogger.org/interview_questions_and_answers_for_hr_executive.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/twilight_breaking_dawn_part_1_full_movie_in_hindi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481154/normal_5feedfd45c2fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_6062dc10bbac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489716/normal_604000b81730a.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/describing_people_s_appearance_english_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_600388d9831b3.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/nawosineromigi/72796474035.pdfIn PDF document text
    • http://nufapuruwibixi.epizy.com/rowasovufude.pdfIn PDF document text
    • http://wavagejofelodun.rf.gd/78345808968.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/86920064693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99db314-5f77-4e29-adf8-db861eebd126/siwisofikamo.pdfIn PDF document text
    • http://fulawumobolofog.epizy.com/rounders_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/32129733091.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/gaxegepewabij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78963517-2d37-4b78-b2c2-ccb206fc792d/nagazubijazuga.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/9868612641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e69cc9-9593-49ee-bda3-8df13ead7b8f/the_mathematics_of_the_ideal_villa_essay.pdfIn PDF document text
    • http://sunenetebemugig.rf.gd/walmart_hours_christmas_eve_and_christmas_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a1d06a-982a-4151-876a-6ef75808d30e/tonivejujetisokanimameli.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_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 5580 bytes
SHA-256: 9390b268e7ffd616cb7ba5a82c93096a9af299ed1da4733624be33937a1ee3e2
font_01_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 11596 bytes
SHA-256: a4bef372b251ba88198d5321c586083cc6c8f76de91fab3921dd69df319bb33f

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