Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade5d32ab91d5436…

MALICIOUS

PDF

84.7 KB Created: 2021-03-14 20:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097e14392fd75fe35d160ad1c650958d SHA-1: 237750ae97d2b1a26c20734840154733b3eb50f1 SHA-256: ade5d32ab91d5436de45b6effad42112b1e88f16408e25d170531a44efe1df5e
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 designed to appear as legitimate documents but lead to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO purposes, likely to distribute phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://bologen.ru/wix?keyword=evolution+and+natural+selection+answer+key
    • https://cdn.sqhk.co/bitaxukezor/Pgh2kha/69078666244.pdf
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5ffdd1f6c2738.pdf
    • http://sifisomatexow.sportsontheweb.net/zasapokubaki.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_60374b7d19ede.pdf
    • https://cdn.sqhk.co/moxoxitij/hdiahea/bineruzufujosako.pdf
    • https://cdn.sqhk.co/gulizate/fx7Kjj8/vesexonuwazuripolutavix.pdf
    • https://cdn-cms.f-static.net/uploads/4414696/normal_602a01214037e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_4eba276528bf4cb599cb61f1dd5c56b6.pdf?index=true
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_52b67f61b79040a28bec6ed0b83d1060.pdf?index=true
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_9fadba995d064564b0c636b8f5c53e84.pdf?index=true
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_f859b82e5ad44257b820557809f9aa8b.pdf?index=true
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_a915f60a75224185b2ddade7b9677611.pdf?index=true
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_34937e274cd54b568d0ef85e34393c7b.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_d8485e4475334d0686ce2a9f7b54b7dc.pdf?index=true
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_29898cbbeed649d9a18e90dac65a49cc.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_8f4f8188cee049688a726dfea15d10de.pdf?index=true
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_527cc95f20f04faf8167b2a2ca8d1473.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_8640b588cb274d65bcfa9a3c065d4ce8.pdf?index=true
    • http://bototiluwoge.atwebpages.com/46699123734.pdf
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_d0ddef605b504da5ba364fb5058f74c8.pdf?index=true
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_d80f3bbcd486402ab7694182957a48f7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001015f.bin
7ad3a8478c5d47b48eb01dcd6bc085071bb3b162561ff1c1a25385bff524e679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 5088 bytes
font_01_sfnt_off000112da.bin
5f98f00ddbae2b87572d6d01e4094233fc73a94300141a6be819b9a3f2199f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 10700 bytes
font_02_sfnt_off00013765.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 4324 bytes

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