Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f0f0a7559b0e72…

MALICIOUS

PDF

71.5 KB Created: 2021-03-17 21:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7824ed2c2a319a52fb865be77fcb336b SHA-1: d1f5181841d66e66ec80eec1acf866f65095d4d9 SHA-256: e4f0f0a7559b0e7264644b6a507248fdccb0eb74c533f6fd5835347865ba23ab
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 pointing to other PDF files, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://zajinet.ru/aws?utm_term=7th+grade+grammar+test', is likely part of the lure to direct users to malicious content or phishing pages.

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://zajinet.ru/aws?utm_term=7th+grade+grammar+test
    • https://cdn-cms.f-static.net/uploads/4366341/normal_601aa1fe694ed.pdf
    • http://rusherx.studio/wamargit6p.pdf
    • https://povisegidugukab.weebly.com/uploads/1/3/1/8/131871963/xivibunaxipejiz.pdf
    • http://latencfsrt.space/el_vendedor_ms_grande_del_mundo_vol_2jzya0.pdf
    • https://cdn-cms.f-static.net/uploads/4413718/normal_602afc132c736.pdf
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/1592318.pdf
    • http://copyrighthelpcentral.com/sausage_wars_io_mod_apk_android_148awd.pdf
    • https://static.s123-cdn-static.com/uploads/4385207/normal_60025d92a2327.pdf
    • https://static.s123-cdn-static.com/uploads/4427273/normal_5feb2d978a8ee.pdf
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6048da328f8f7.pdf
    • https://cdn-cms.f-static.net/uploads/4409110/normal_603c442630ed3.pdf
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fefcb9d1cd5f.pdf
    • https://cdn-cms.f-static.net/uploads/4501046/normal_60369560e468f.pdf
    • https://cdn-cms.f-static.net/uploads/4489415/normal_5fd9abd072f52.pdf
    • https://cdn-cms.f-static.net/uploads/4460678/normal_6030f565b0be2.pdf
    • https://cdn-cms.f-static.net/uploads/4421039/normal_600d2404ae587.pdf
    • https://cdn-cms.f-static.net/uploads/4477638/normal_602638900c96e.pdf
    • https://pisaloxonuk.weebly.com/uploads/1/3/4/3/134391291/5081614.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_8637ee09eb2649d49d98207c0d48c117.pdf?index=true
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_cff3522fe9c843be9d38ba9b09f76cb0.pdf?index=true
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_639146477d664366b2b3b94a35b065a8.pdf?index=true
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_22063fdb16704e5ca04569a7161bc70e.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_off0000daff.bin
64a0ef2178223c9a91f7b758b9fb1a44361f6554148685d34d79738568fb0eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 5192 bytes
font_01_sfnt_off0000ec7c.bin
e7d528077d18baf70313ec2c5793f3aebea02514acac995eab6f08a226e83622		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 10796 bytes

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