Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a717063aa0dc8df…

MALICIOUS

PDF

82.3 KB Created: 2021-04-07 09:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85155efa4e92245afb99f94be36dae4f SHA-1: 7b12940d815c7ffca18eb525c9ec69e4c57d7871 SHA-256: 4a717063aa0dc8dfcb1f804406081d048bbc479a6c76205037a476b991de671d
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://lozipotod.ru/123?utm_term=best+browser+video+player+android', is presented in a context related to browser video players, likely as a lure. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=best+browser+video+player+android
    • https://cdn.sqhk.co/liralimujote/IWjcwYL/dynasty_warriors_characters.pdf
    • https://cdn-cms.f-static.net/uploads/4494891/normal_60405adcbcd15.pdf
    • https://cdn.sqhk.co/xunixenovapi/iehb4gi/88226615946.pdf
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5ffd7214b6b4e.pdf
    • https://cdn.sqhk.co/madufuxenuw/b14H0fg/jupevutuxafanadika.pdf
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5fc981307c014.pdf
    • https://cdn-cms.f-static.net/uploads/4480162/normal_6057ac4881f2b.pdf
    • https://cdn.sqhk.co/xudogafu/gfhiS2T/crochet_tabletop_tree_skirt_pattern.pdf
    • http://kipokefurur.mygamesonline.org/80222534038.pdf
    • http://tokepubex.getenjoyment.net/webame.pdf
    • https://cdn-cms.f-static.net/uploads/4448733/normal_6058b8cd69a1f.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_60568c6e542c6.pdf
    • http://faponabon.mygamesonline.org/ielts_recent_actual_test_2020.pdf
    • https://cdn.sqhk.co/zejegure/hbAhehh/33915110589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_67902de8ffa64a588eeb75cec8a6e673.pdf?index=true
    • http://muberugaguto.epizy.com/butobolaja.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_65d9beac211940848feeb6df6be162a9.pdf?index=true
    • http://xetuvekena.epizy.com/felakaje.pdf
    • http://burupilejeg.epizy.com/18153882450.pdf
    • http://fepobetef.rf.gd/dumunuluzododenunuledaje.pdf
    • http://fokibuzevurir.rf.gd/daily_meal_plan_template_excel.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_off0000f82f.bin
a397773e00e1aac04f88cf4e53c65fa61c8592332e9a2add8f7b730bb47c2016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 5184 bytes
font_01_sfnt_off000109ed.bin
535623bd62aa5317e055bf6714ed667e97a3f55d407064f2b89d82b3006a56db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 10480 bytes
font_02_sfnt_off00012dc3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 4324 bytes

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