Malicious PDF — malware analysis report

Static analysis result for SHA-256 270b4e6dc37eea86…

MALICIOUS

PDF

80.3 KB Created: 2021-04-07 02:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 874d585a7e8c6dee26a30253a40b3a20 SHA-1: cf52f19549d91442d305e5295954c5068c75e3f6 SHA-256: 270b4e6dc37eea8647514889beedadcf91f6652db04b4b9a8fbbd362a558a60d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'software feasibility studies'. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=ejemplos+de+estudios+de+factibilidad+de+software PDF link annotation
    • http://1xbet-football.fun/dajefopy4sc.pdfIn PDF document text
    • http://formblckr1.xyz/rimedmx9fy.pdfIn PDF document text
    • https://cdn.sqhk.co/zepinima/1yNYlhd/59308468809.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/o1W076O/rarewiluxifoxizepedofufar.pdfIn PDF document text
    • http://iuts.space/fibowofenonijne5d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_60476e7fa6d94.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jjMpha6/venuxupefexiramijurafekos.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/hbhfi7B/real_cricket_20_download_for_pc_without_bluestacks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_600778d62e041.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/aeLhfgi/dogotatugilofemu.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/heqicia/17461027797.pdfIn PDF document text
    • http://fherixq.com/739106684476tf11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_60696bf4c7274.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/definition_of_goodwill_in_accounting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/laraxijologeneki.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/43444550110.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/dieta_de_zanahoria_y_papa_de._norman.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/nonajuj.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/suvorupalivaxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 5344 bytes
SHA-256: cd11a087fa19098b78b180f22984018b27a42e7a0c3ce85441f1157d4a3f7e1a
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 12044 bytes
SHA-256: 17a94cdd72e090e83457b098b1dd724756999f9c40ebc2b38905c66fed7f9adb
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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