Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1d8e7d20048e51…

MALICIOUS

PDF

88.1 KB Created: 2021-03-15 18:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 389fa2ecb704513b544fab9e875ff702 SHA-1: 84b103a64d5f661c6826ca3482e95d712e60ef1a SHA-256: 0f1d8e7d20048e5111fa4873995e93e6fb9ba67a03a304181319a58ee4cd5a4f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, with one prominent URL pointing to 'nipisod.ru/strik', suggesting a potential phishing lure or redirection to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=wing+chun+movie PDF link annotation
    • http://interstart.online/osmosis_and_diffusion_review_sheet_answers1m3dy.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/lafuv_pizuzukoduro_zexeko_golixireful.pdfIn PDF document text
    • http://naturaleone.space/sonu_mobil_ktphanep85le.pdfIn PDF document text
    • http://awpmode.com/nhc_khiu_v_cha_cha_cha_khng_lih8lc8.pdfIn PDF document text
    • http://lorenbayi.com/83199576773kv1g1.pdfIn PDF document text
    • http://alex-chekalev.com/lekuredopalajigorolijepemrrpt.pdfIn PDF document text
    • http://kihepc.xyz/lisutanumuligovidunour5.pdfIn PDF document text
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/nigeboxabob-lubamavoxedinu-tefujisap.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/simujix/japan_car_auction_sheet_carused_jp.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_b5b4c3b8b7e24a2a99089519db02d53d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/musica_abiude_engano.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/wpf_binding_string_format_datetime_culture.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/74624904640.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/waput.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/1674635389.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/bapimevixugazixeloval.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_573efc9218774070b65eed537ea0c9ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitatotol/51347738380.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_1deb6303d3454ae69c97716feb9e9ede.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_7e0a66485a5140bea014201b5ca19787.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/latufenaw/mazezodopaveku.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_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 9984 bytes
SHA-256: 79f0e5dd7a02fe494efeac3e0bbe75bf984c94bb9f39e033b8b05b8d40a4fc6d
font_01_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 4768 bytes
SHA-256: 4ac87983fda0f1f3e1f51db4b02930239601b2f95c40c5ebbac301340c1bc0f8
font_02_sfnt_off0001292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 13088 bytes
SHA-256: d9eb61f8d51b1f6b5816b91daefe3499bce4c84c97b944849ab2097ef12faf05

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