Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0eb6b6522af691…

MALICIOUS

PDF

78.6 KB Created: 2021-03-19 12:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da377aa73505ac4a1ba82cf2222d6dbe SHA-1: 2df179caec1596e8135d66fc4f1f643f4d67422f SHA-256: 5e0eb6b6522af6912c027a211e1ea39435c881a39091de44d255ef01f43b3144
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URI points to 'https://vilenefex.ru/wix?keyword=label+heart+diagram+worksheet+pdf', suggesting a phishing or scam attempt disguised as a search result. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

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://vilenefex.ru/wix?keyword=label+heart+diagram+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4445532/normal_600dc4369ce2a.pdf
    • https://cdn.sqhk.co/rifelefiw/Wh6ggs2/samsung_pay_not_working_s8_plus.pdf
    • https://cdn.sqhk.co/voxoduvi/6jijgie/vogizul.pdf
    • http://jekefidaz.mygamesonline.org/42106067032.pdf
    • https://cdn.sqhk.co/dupabeket/ie32ifu/ldoe_bunker_alfa_code_march_2020.pdf
    • https://cdn.sqhk.co/tizalenifo/bApjbjg/donkey_kong_arcade_for_sale.pdf
    • https://cdn.sqhk.co/tevosenijosu/8tVuXhc/best_razor_prank_app.pdf
    • https://cdn.sqhk.co/jezuleku/jwXRgjr/81611327545.pdf
    • http://faxusupovetek.sportsontheweb.net/how_to_do_taylor_series_expansion.pdf
    • https://cdn.sqhk.co/reriwoduriju/vifOu1g/funny_horse_farm_names.pdf
    • http://nogurufegu.mygamesonline.org/todose.pdf
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5fe672379d0a2.pdf
    • http://vizilirudigub.getenjoyment.net/banking_awareness_testbook_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_62172d191a3e4359b424de6b80f7ee39.pdf?index=true
    • http://bakotege.rf.gd/androeed_ru_pocket_tanks_deluxe.pdf
    • http://xusixuxoribixe.rf.gd/cours_d_automatisme_industriel_gratuit.pdf
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_677ff3fa6d924a7da8805c4a9a573009.pdf?index=true
    • http://mazolofoju.epizy.com/75920020193.pdf
    • http://sasukagisodubex.onlinewebshop.net/hollywood_the_dream_factory_an_anthropologist_looks_at_the_movie-makers.pdf
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_7d6c725fc47c4a17910eed0023062c1d.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_c56177186724444da4ce2b1193b53b14.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_7d9f038e3bd747959534a28aef812036.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_off0000e7ec.bin
13966e5ab1ba902c427806b1ee9a40b809225ddb828c88c938970cb67c8fb6c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 5376 bytes
font_01_sfnt_off0000fa43.bin
a71df2af50e06ac9448e9600625deec270fbd9635c31105f26326efca2d35e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 10720 bytes
font_02_sfnt_off00011ec2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 4324 bytes