Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a27b49ee16e96d5…

MALICIOUS

PDF

70.3 KB Created: 2021-04-05 06:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43e4549009e76eff25b6df50b1257d26 SHA-1: 503f535a7276e569d998ffd8f27705839954f354 SHA-256: 1a27b49ee16e96d5b985145fab4d7130fcfc828f5c16dbf33439b2ea37423061
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, including a link farm, designed to direct users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=benjamin+cooper+medford+lakes+nj
    • http://vugivanasidej.22web.org/uppcl_previous_year_papers_for_assistant_engineer_electronics_download.pdf
    • https://cdn-cms.f-static.net/uploads/4404103/normal_603788e56f4e6.pdf
    • https://static.s123-cdn-static.com/uploads/4379837/normal_5fdd79f507d1c.pdf
    • https://cdn.sqhk.co/remowiwa/Gt04whd/emoji_keyboard_cute_emoticons_gif_stickers.pdf
    • http://wovegibexakebof.iblogger.org/sfinae_vs_template_specialization.pdf
    • https://cdn.sqhk.co/poxudanefisi/h65haGf/32071048590.pdf
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/5724674.pdf
    • https://betiriwusogaz.weebly.com/uploads/1/3/1/3/131380032/49f7069c37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_c122c4e0e4304f41b15417df618dfb18.pdf?index=true
    • http://gimerige.epizy.com/note_taking_worksheet_chemical_bonds_section_1_stability_in_bonding_answers.pdf
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_b47bc7bea3cf4a39a22f85f871c3d2ec.pdf?index=true
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_e15bc1c1ea6b4d878aab57c778600150.pdf?index=true
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_1d0efa7a1abf480ab04d97b099c9383b.pdf?index=true
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_d640e9e358ae45b4b6521a420435f439.pdf?index=true
    • http://jezuguxefigowi.rf.gd/rudram_chamakam_in_kannada.pdf
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_41e46f7baa294277a1f4e64364032a1c.pdf?index=true
    • http://susofukezozuwuj.epizy.com/jiwumukirogerewesozanevu.pdf
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_aba1d0c594e547349164103805e2645a.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_off0000d513.bin
772d5bc0839dd52e9577d085d2d870d6b5ef7f61088d54c8ca8b6c8980438535		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 5488 bytes
font_01_sfnt_off0000e7b0.bin
19bf52dc348e342c4ecd3a4fdf4b913a7d92a56157223e34d3eb855170546b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 10952 bytes

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