Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dab7d1c0f7a7671…

MALICIOUS

PDF

81.9 KB Created: 2021-03-29 08:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cb8d890732e02b8b8bec0180edba835 SHA-1: a6b39dd3cf01461a35064c104ca364c0f20b66e5 SHA-256: 1dab7d1c0f7a767135b839a4cb06c815029b9841e5a4df214bc1a64fc5070832
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to create a link farm for SEO manipulation or to host malicious content. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/aws?utm_term=fishman+aura+sixteen+review
    • https://finiluxib.weebly.com/uploads/1/3/5/3/135350298/latepewuvewi.pdf
    • http://lojapidabud.mypressonline.com/concrete_microstructure_properties_and_materials.pdf
    • http://moxilekulina.getenjoyment.net/kejarufogumuru.pdf
    • https://gavuwexis.weebly.com/uploads/1/3/4/7/134772394/8820140.pdf
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/5baa16.pdf
    • https://cdn.sqhk.co/wobivada/QhjVjfQ/nintendo_switch_buy_online_uk.pdf
    • https://bemaxeviliw.weebly.com/uploads/1/3/4/4/134482954/9224935.pdf
    • https://cdn.sqhk.co/kozuvurop/hadGduU/65125059379.pdf
    • https://digojumowixev.weebly.com/uploads/1/3/5/9/135989627/a4e48289.pdf
    • http://jozipuvuwuzaj.mywebcommunity.org/pefasapefewubisefuvaj.pdf
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/3025122.pdf
    • https://nonelugo.weebly.com/uploads/1/3/0/7/130775267/8416444.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/faluzotixupi/black_and_white_star_border_template.pdf
    • https://s3.amazonaws.com/xakapudakadu/printable_comprehension_worksheets_for_year_3.pdf
    • https://s3.amazonaws.com/jenisozazewubo/transunion_industry_insights_report_q4_2017.pdf
    • https://s3.amazonaws.com/libusamagowuvo/21898028206.pdf
    • https://s3.amazonaws.com/waxegatulo/17231394694.pdf
    • https://s3.amazonaws.com/xotomisen/algebra_1_common_core_teacher_edition.pdf
    • https://s3.amazonaws.com/dewazewokib/the_shining_explained_ending.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79f.bin
ba7c192b7b869093c8167b66662d3c755177c60a598065dff4f462aa5c1b734d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 4840 bytes
font_01_sfnt_off000107e9.bin
1211d78095c3b40f896e71033b32891f947422b6498f79ed7f4b400ef6477761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 10680 bytes
font_02_sfnt_off00012c43.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 4324 bytes

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