Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe8bdf41026a05b…

MALICIOUS

PDF

69.9 KB Created: 2021-03-23 18:55:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf9d422508cae1f5f5477ebde0f3671 SHA-1: d7fa741c6b41dec3a882be88f35200a79307075e SHA-256: 5fe8bdf41026a05be078524b12dbe3e76df7e3dfeb3d0906a487ce856c8258a3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are disguised as educational materials, suggesting a link farm or phishing attempt. The primary external URI points to 'https://xezojetit.ru/wix?keyword=stewart+calculus+7e+solutions+pdf', which is likely a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://xezojetit.ru/wix?keyword=stewart+calculus+7e+solutions+pdf
    • https://cdn.sqhk.co/kigakikijebo/ggbjhkU/857523964.pdf
    • http://lozejebivo.scienceontheweb.net/principles_of_naval_architecture_vol_3.pdf
    • https://cdn.sqhk.co/tibidimewako/g3jgGMv/samsung_clp-_310_toner_reset.pdf
    • http://kuvenumine.mygamesonline.org/mibokamikonatonixon.pdf
    • http://gixapedotamerow.mywebcommunity.org/nunixegumudaribikubupadiz.pdf
    • https://cdn.sqhk.co/nasubivapu/fggAiia/the_sims_mobile_online_oynan_yor_mu.pdf
    • http://ladiluvame.mypressonline.com/bavebeviwipinozuzovuk.pdf
    • https://cdn.sqhk.co/porosobof/iihwhjI/lighthouse_church_of_god_ketchikan.pdf
    • https://cdn.sqhk.co/womafafowix/ivoLieO/auxiliary_equation.pdf
    • http://vazawujuzu.sportsontheweb.net/the_five_dysfunctions_of_a_team_review.pdf
    • https://cdn.sqhk.co/liralimujote/dayidD6/82494686608.pdf
    • http://xuvaxujogilo.mygamesonline.org/fitzgerald_aeneid.pdf
    • https://cdn.sqhk.co/xinoxoxojib/fjfTcji/17338953332.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_c388435e8c8a48ef8ac411c8e94d4e22.pdf?index=true
    • http://fidegaf.atwebpages.com/loxutekenagowigip.pdf
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_60930261cea64f01995963f977ec8e6c.pdf?index=true
    • http://dafuwinev.myartsonline.com/titesi.pdf
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_b4b2fa99451b40b4a4981e60468690db.pdf?index=true
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_980308c8cb164ff890990c57435250d5.pdf?index=true
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_e6209f1bd4be4474bd290c1e4699654c.pdf?index=true
    • http://maxuluxusit.atwebpages.com/cv_for_sales_executive.pdf
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_26b40ebc1c924bf3b45aab37f7bb21f1.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_008837118e944882bede3e75197e7a5e.pdf?index=true
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_8c42084912634eb0af3ee3a3dc0d6d11.pdf?index=true
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_26d3b495139044d686c3090aab5a4efb.pdf?index=true
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_6bb2b177cfc043b08fdcc1b4f8e018a5.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_off0000d281.bin
2725f6425e1395e2bc14b57ce8b8257874ac00c23d5d22ccc4fca0afef360cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 5424 bytes
font_01_sfnt_off0000e520.bin
1813ecf2b6a048ff4ad64270fcb3eb058e0ddba1aa352a457740825bd510f5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 10720 bytes

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