Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ab75546102745d…

MALICIOUS

PDF

75.6 KB Created: 2021-03-07 23:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d7de3da495c2074f41e5d7734b61eaba SHA-1: a1474427e1c6b4ed3cf7c64d64f1fe2e4cdc352d SHA-256: d0ab75546102745dc4ee075c856714b4f473fdc6e7086bb97f92d2e7a47979ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://baarspo.ru/strik?utm_term=how+to+use+central+pneumatic+6+gallon+air+compressor', is likely part of the malicious infrastructure. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://baarspo.ru/strik?utm_term=how+to+use+central+pneumatic+6+gallon+air+compressor PDF link annotation
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/fuvatuxukuzan_guwudixub_jebenudumor_fopinifaraf.pdfIn PDF document text
    • http://profmaster74.ru/busuwurxj8y3.pdfIn PDF document text
    • https://fukukajapojuj.weebly.com/uploads/1/3/2/8/132815924/bejijenokopadug.pdfIn PDF document text
    • http://znasila.ru/koberatiwip1i9m.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/waltz_b_minor_chopin_sheet_musicr53nj.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/2042687.pdfIn PDF document text
    • http://legendbilisim.com/la_mujer_multiorgC3A1smicanv0qw.pdfIn PDF document text
    • https://tupobufilu.weebly.com/uploads/1/3/5/3/135310482/9e8542.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/repigetoxelul-rovatu-zowajezanu-xobovulak.pdfIn PDF document text
    • http://requiredjokblog.com/maths_tricky_quiz_questions_and_answers1u091.pdfIn PDF document text
    • https://temoxemotedi.weebly.com/uploads/1/3/4/5/134599163/2010152.pdfIn PDF document text
    • http://tryadasert.online/resevunixirehllli.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/kotenu/80977878346.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/11210080021.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/jivirulixoborarumigodob.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/the_boy_who_harnessed_the_wind_true_story_book.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/awareim_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/formation_alternance_communication_toulouse.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/whats_the_order_of_the_metro_games.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/badaga_old_songs.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 5460 bytes
SHA-256: 5d890b0e9d25df6abb420106b054155827e9f98060d1ca3c3a9c55b49a078c4d
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 10340 bytes
SHA-256: ac9e0894639224a0a1e46e01d17c6e90cfe375d0d4d590670ab068faf0992f9d

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