Malicious PDF — malware analysis report

Static analysis result for SHA-256 202b94988f90addd…

MALICIOUS

PDF

111.6 KB Created: 2021-03-25 23:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 10d4827ed4a63fd255f260b2b16d64f5 SHA-1: 8e3c250e419f5d09cc59cbee9c184accfd44c781 SHA-256: 202b94988f90addd24371f2e9e1269822b70ff2bebf1b389cd7231f1c5567bcd
186 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to other PDF files, with a significant number hosted on disposable domains. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to manipulate search engine results or distribute further malicious content, potentially via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/award?keyword=the+marriage+covenant+samuele+bacchiocchi+pdf PDF link annotation
    • https://tanutalavisa.weebly.com/uploads/1/3/4/0/134000413/1963250.pdfIn PDF document text
    • http://tovelksa.website/tomo-chan_wa_onna_no_ko3liip.pdfIn PDF document text
    • https://waforavorodi.weebly.com/uploads/1/3/4/3/134314120/pilirafozuteki.pdfIn PDF document text
    • http://belkwigs.com/878996421731micp.pdfIn PDF document text
    • https://likomajuf.weebly.com/uploads/1/3/5/3/135321460/bevizenubunazeb.pdfIn PDF document text
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/kodepinalisekor_tukera.pdfIn PDF document text
    • http://nncucuucuc.space/how_do_i_find_out_my_child_support_balancee5xzu.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/beb93ebdf1049b2.pdfIn PDF document text
    • https://cdn.sqhk.co/nisonodoweb/jhcFfsL/decimal_worksheets_4th_grade_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xurakipigub/b3ctGhf/plague_inc_walkthrough_fungus_brutal.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/7a07c587602b.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/fiwunozuwitafikanaxaj.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/lusabifef/tilobowibupiranogovu.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/fox_channel_schedule_tv_guide.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/30872951929.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/55298678594.pdfIn PDF document text
    • http://riledabetime.myartsonline.com/sympathetic_and_parasympathetic_nervous_system.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/patofebixaxevemopata.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/light_bulb_icon_vector_free.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_off00017852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17852 5716 bytes
SHA-256: 018315db5792477a55585238e3f0d461782132d317161cfc621a641488aa68c0
font_01_sfnt_off00018ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BA2 11028 bytes
SHA-256: eb98bdb6e28629885b153272ed6e9a5d73b00c39a434f58e18c6569bbd7d1a33

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