Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cda0345bd08f24e…

MALICIOUS

PDF

81.9 KB Created: 2021-03-21 22:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e777d1968c3ffd15ef531a344d3aed29 SHA-1: 5628d999151c44e48efc120234acb4a6277963c0 SHA-256: 8cda0345bd08f24e4d3cc78a6feecc9534f7bf3a324bccf5cd31f0eb5e2cf3e0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=walking+dead+comic+book+issue+100
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/6357f.pdf
    • http://nuloriwilorij.scienceontheweb.net/19839510367.pdf
    • https://static.s123-cdn-static.com/uploads/4469638/normal_60091f6f1bfa6.pdf
    • https://lakiregatu.weebly.com/uploads/1/3/4/5/134589313/9504202.pdf
    • http://lenulari.mypressonline.com/xoladat.pdf
    • https://nojonepidafajik.weebly.com/uploads/1/3/0/7/130775859/8fb73feb9.pdf
    • https://cdn-cms.f-static.net/uploads/4373248/normal_604a33864b46c.pdf
    • http://wogivodugakovek.mygamesonline.org/jevisokirumewipa.pdf
    • https://static.s123-cdn-static.com/uploads/4403410/normal_5fccee6698481.pdf
    • http://gufebuxixubo.iblogger.org/89067355379.pdf
    • https://cdn-cms.f-static.net/uploads/4475989/normal_60571ed16c46f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_f6d00e7a268b434ea36212092c1ffc3c.pdf?index=true
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_3bf102adb3df4a83951431ef294b0797.pdf?index=true
    • http://newosanovaf.epizy.com/sogafofukerid.pdf
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_a9af53b282014d9483c50d7c2ffedb13.pdf?index=true
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_10a0112208584684bc15478b8a65bf6a.pdf?index=true
    • http://rozekajabunupet.rf.gd/bronchite_aigue_et_chronique.pdf
    • http://taguloxutenafol.myartsonline.com/releditibeseperajuv.pdf
    • https://s3.amazonaws.com/xarojapi/messenger_app_for_android.pdf
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_0ac9b55b84074c0a8bdd17b637ba0fad.pdf?index=true
    • https://s3.amazonaws.com/wizitifowubux/game_god_of_war_apk_mod.pdf
    • http://fevidubigozexa.rf.gd/74530820242.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_off0000f579.bin
ee626a61c4782750d4b89132a7f6dd2e743033cb00a36ee464f187d94ca46a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 5376 bytes
font_01_sfnt_off000107ad.bin
ea8abc8ae130c4df9a7d16e2b2d99a750687ba0b62af1ec0e400028d0439b5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 10760 bytes
font_02_sfnt_off00012c2f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.