Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b10d8305a61ec8…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 11:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4835a33bb7090919688623d93e7756a SHA-1: 205b52cb2e2c47a59b6497a9d4775a0e43fb23da SHA-256: a1b10d8305a61ec81c67d50844384980bde68cc888867b65dd15300a333ebe4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated to appear as SEO content, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL and the PDF link farm heuristic point towards the document's purpose of directing users to malicious websites.

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 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.
  • 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://nipisod.ru/strik?utm_term=what+did+darwin+discover+in+south+america PDF link annotation
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/f5ff0c1debf79dc.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/fojogozejaxovusazuxom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_603484a7e00e4.pdfIn PDF document text
    • https://lupabarudu.weebly.com/uploads/1/3/1/3/131398308/neliva.pdfIn PDF document text
    • https://fagojature.weebly.com/uploads/1/3/3/9/133987822/f3dcb4.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/jikopot/jungle_book_vulture_song_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/adeste_fideles_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/3000696086.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/syncope_guidelines_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/geographical_information_system_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/48221165868.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/alvar_movie_songs_free.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/convective_heat_and_mass_transfer_3rd_edition_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/44924491704.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/10985454170.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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 5312 bytes
SHA-256: d7b93ed43a986199f5b9c0676bbf8c759270373cfa107d6bbb7515a961f88aff
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 11152 bytes
SHA-256: fe494928f0149d1264dbc28b107a3ec185ae410abe88a718ef26577d032555b0

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