Malicious PDF — malware analysis report

Static analysis result for SHA-256 239a3dd907e15303…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 07:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fa1a1dc2554ec8916a51cf54ac7dca1 SHA-1: 4096eb1776d5ebb4b1b115cadbe1362ee096f41b SHA-256: 239a3dd907e1530325c944ffe2c7ae1b143b50639ec059fb100f10bc5b01d5e1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a link farm designed to redirect users to other sites. The document body, though heavily obfuscated, suggests a lure related to Spanish language learning materials. The presence of multiple external URLs and the PDF_SEO_LINK_FARM heuristic indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=regular+ar+er+ir+verbs+spanish+worksheet
    • https://cdn.sqhk.co/nujidegowupi/ixUcwhf/minecraft_education_edition_download_skins.pdf
    • https://cdn.sqhk.co/puvubuzu/GGQjhhg/fegomopufukixafopitesu.pdf
    • https://cdn.sqhk.co/rijatazuga/jhhd0ja/1943135751.pdf
    • https://cdn.sqhk.co/lomasamube/iv8jh7N/contract_killer_zombies_2_ios.pdf
    • https://cdn.sqhk.co/texonatuzi/ORiighf/19040870432.pdf
    • http://dazolovegom.mygamesonline.org/apft_push_up_sit_up_standards.pdf
    • https://cdn.sqhk.co/fafafesabok/Bjgciha/73792858271.pdf
    • https://cdn.sqhk.co/bemememu/hfLhh78/29080064247.pdf
    • http://wunuvuzixuxi.getenjoyment.net/allelopathic_effect_on_seed_germination.pdf
    • http://dowotezovemalo.mygamesonline.org/3318859236.pdf
    • https://cdn.sqhk.co/padirazemi/Wgc08ia/simcity_buildit_cheats_no_survey.pdf
    • https://cdn.sqhk.co/veletafi/thjiepi/rummikub_game_near_me.pdf
    • https://cdn.sqhk.co/nodezaneripe/swjehhf/pj_masks_moonlight_heroes_gekko_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pulitisagot.atwebpages.com/antinomie_definition.pdf
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_55a2e8450da74b4c8a4a3512c1cc2af4.pdf?index=true
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_145ff8e78e0b435eaab3d7d8dd54b758.pdf?index=true
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_8d72a1ea40364a76a683a38b59b67545.pdf?index=true
    • http://jajogagek.atwebpages.com/dewigajir.pdf
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_f29ef652512a418cb473c997043b5f4f.pdf?index=true
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_65f960fdea11493db72b4df7b61f5676.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_off0000f264.bin
1c0bb08547ce41533454750c6f44f3b110e21290c412f1ca4569bd0338fc8915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 5328 bytes
font_01_sfnt_off0001048d.bin
20cc40ec6f1b894e3ef0060159e241fcbcc74a0d41f2614ee58b477f7aa04ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 12684 bytes
font_02_sfnt_off00012e8e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 4324 bytes

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