Malicious PDF — malware analysis report

Static analysis result for SHA-256 9343301ce5054bf0…

MALICIOUS

PDF

89.3 KB Created: 2021-03-21 09:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 993e30e230fdbace88ce6f6b4bc7cda6 SHA-1: ae9ff3578771c3733ec5b42f90454b15f347ff37 SHA-256: 9343301ce5054bf0ba8f5da7f94dff5b10573c18d1f130ed7e69b5d286163a31
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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://jacksth.ru/award?keyword=avital+ronell+the+telephone+book+pdf
    • http://shlifovka-pol.website/xenawivitiparegaxokapizefkw7s.pdf
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/b6a6560c2eeaac.pdf
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/8576404.pdf
    • https://noparageselex.weebly.com/uploads/1/3/1/8/131856757/6576165.pdf
    • http://quinzsy-studio.design/zombies_vs_diy_store_combo_10qffh1.pdf
    • https://kopopoxewa.weebly.com/uploads/1/3/4/5/134597570/5a0ae1d14127b1d.pdf
    • http://hopecommunitynaz.com/fishman_loudbox_mini_bluetooth_reviewj3n2o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_d50ffcf642ca4975a5bf2659a9090e6d.pdf?index=true
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_efa1aba6ef264368bc78701072ce9393.pdf?index=true
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_6fcce09b946e4f1bbc592c3702aff495.pdf?index=true
    • https://s3.amazonaws.com/gezejoputiwinu/knighthoods_reading_answer.pdf
    • https://s3.amazonaws.com/jejulurowev/pironik.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_fb927ae1647141cf9e31620a1bee2ffb.pdf?index=true
    • https://s3.amazonaws.com/firudegix/30073150026.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_8d578c39952c4600bc137e6ac22f83a4.pdf?index=true
    • https://s3.amazonaws.com/jadudusujuje/83872661055.pdf
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_43b60d996257406b8e8d14af738f7e01.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_off000112e8.bin
18554b02b5e23e63d745ba88fb63f7ec618acf47fea9f3c70fa13503a106c311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 4992 bytes
font_01_sfnt_off000123c6.bin
a8ebc90a6fe67292f4496b2aeac7bdd51e14e49a6560cdb75928242bebedf322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 11208 bytes
font_02_sfnt_off00014a0e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0E 4324 bytes

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