Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30208c1a998bc35…

MALICIOUS

PDF

73.3 KB Created: 2021-03-29 18:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 983610df470d856febaacd630c293f7e SHA-1: 7b4226ee12bbb895c4e12097264ed4cd2ad58246 SHA-256: f30208c1a998bc3595ca028b292da99384ef0c91e526f19ba80235b562ae31d9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or designed to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=insufisiensi+plasenta+adalah+pdf
    • https://cdn-cms.f-static.net/uploads/4378171/normal_604bca7d4c69d.pdf
    • https://cdn-cms.f-static.net/uploads/4382962/normal_601b66ed7ee5e.pdf
    • https://cdn-cms.f-static.net/uploads/4426262/normal_605f5cf729c38.pdf
    • https://cdn-cms.f-static.net/uploads/4486758/normal_6041544b2de50.pdf
    • https://gobunelesivuwol.weebly.com/uploads/1/3/2/3/132303092/4441671.pdf
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/7068695.pdf
    • https://dimazupaw.weebly.com/uploads/1/3/2/8/132814154/tifawovi.pdf
    • https://cdn.sqhk.co/divojimo/jjgckAt/color_direct_thermal_label_printer.pdf
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/tedewusidegomokax.pdf
    • https://cdn-cms.f-static.net/uploads/4415046/normal_6044cd1d3df73.pdf
    • https://cdn.sqhk.co/bowevuva/dFlkhbB/subalidupunolugeboveg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuvovoxigumuz/xafuboluluwanerug.pdf
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_464d78c70af7417c860567544fd67e1d.pdf?index=true
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_4f513de509a04b99ac467dcedd680b8b.pdf?index=true
    • https://s3.amazonaws.com/vekodupiwarobi/user_guide_iphone.pdf
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_c17329a391374d83aab2be9548d434cf.pdf?index=true
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_6602ae843d4f4c14a9753e10e9e233fe.pdf?index=true
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_a160e8f7cd204fa1a34f3babce3e1680.pdf?index=true
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_ea0730da5146443b87f13f2633dd607b.pdf?index=true
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_812bb72f4e2b4b948af0c60117f5b6d0.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_ad053517d5e848e78a2cf6506a392525.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e522.bin
af69ba8187ec9f9b1c3cfdd991e675fafa86e6ba3d85a144c00495cfd87ae860		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 4968 bytes
font_01_sfnt_off0000f60a.bin
3fcc36e2be381f4b86e3a5a8f582432d487360fa091970901f57bace8ffa7602		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 9876 bytes

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