Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5baaf518b59c11…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 17:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bdff32f43cf844a1db0c5df438b38d6 SHA-1: b7d0c0a8b45aa4fe5009bbf7bed9b1701bc7b8da SHA-256: ee5baaf518b59c1176f08b49c49dd7d61368df12cfc463fd3a934cd265f7bcd1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of numerous external URLs suggests an attempt to redirect the user to malicious sites.

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-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://druttle.ru/wix?keyword=ezgo+service+manual+pdf
    • https://meletiwupidime.weebly.com/uploads/1/3/5/3/135313264/semewuwo.pdf
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/jabudosomu.pdf
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fceea14af376.pdf
    • http://antinomi.design/how_to_teach_singular_and_plural7byaf.pdf
    • https://cdn-cms.f-static.net/uploads/4377662/normal_604d61862a442.pdf
    • https://static.s123-cdn-static.com/uploads/4370302/normal_5ff34ad27e24f.pdf
    • http://lozhobelir.space/65156738551t9ftu.pdf
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/famekonusi_zabatuxiwed_salexekolamolo.pdf
    • https://silatasetexa.weebly.com/uploads/1/3/1/6/131637876/pijosavumevufe_xomoxusa.pdf
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/tirizupelotot_vajevetiw_lirexikufawame.pdf
    • https://static.s123-cdn-static.com/uploads/4459320/normal_60044a1242d92.pdf
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5ff64faec997a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc92a35e-d1af-43eb-86a8-929c762ddc25/cuantos_libros_tiene_la_biblia_cristiana_en_total.pdf
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_5288289533d1462ea386d7c6d15733ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c0cf289d-cde1-4fcd-ae41-11fb732c1b6c/laxisaremaxak.pdf
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_daa10c11cda2415988d538ecd470106a.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_4c8fbc964c824de2be0e5c6e634926b5.pdf?index=true
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_e5bbfb333f834c27ad3516faddef5622.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_off0000f937.bin
694767e1f651b8f2a8a3e4033492e3aba49a62055718998dad1ff2a6c276b959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 5544 bytes
font_01_sfnt_off00010c19.bin
2bc867a47e686fb9afb72bbdd5dbe141b0d3b55b6be6a4d4d18033f1688ecd2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 10656 bytes

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