Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83a81875c17480d…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 01:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5b73e6b6e9bfaedb2bee43e912c462 SHA-1: 30992ff13f25691508c2d98da39964f6e0abf8f7 SHA-256: b83a81875c17480d5c8235a2de348876012f06a315525097818c037d7a3417ac
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on dynamic DNS services or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs, such as https://ponafet.ru/strik?utm_term=john+paul+jackson+perfect+storm+youtube, are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=john+paul+jackson+perfect+storm+youtube
    • https://cdn.sqhk.co/foxinukepo/Digih9c/57779204211.pdf
    • https://novenoberube.weebly.com/uploads/1/3/0/7/130776641/jusidotapamel.pdf
    • https://cdn.sqhk.co/nenuguvan/ojeDMhf/18487281041.pdf
    • https://migerele.weebly.com/uploads/1/3/1/4/131453560/duzubijuzu.pdf
    • https://balolekuzuwuvaz.weebly.com/uploads/1/3/0/7/130740598/xolejowojo.pdf
    • https://cdn.sqhk.co/leporolino/yysibjg/t_mobile_phones_without_contract_for_sale.pdf
    • https://cdn.sqhk.co/gebitasixa/sj5ihhh/fufijomu.pdf
    • https://cdn.sqhk.co/gefimiwotux/hhhahag/family_lesson_plan_activities_for_toddlers.pdf
    • https://cdn.sqhk.co/vapezuwe/egiifii/water_glass_bottle_mockup.pdf
    • https://cdn.sqhk.co/xoxamomajil/frA9K1G/puffin_web_browser_apk_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kinadofi.epizy.com/best_english_sentences_for_daily_use.pdf
    • http://tizosekose.rf.gd/30427513199.pdf
    • http://kimafixenij.epizy.com/pedamegim.pdf
    • http://keporeninudo.rf.gd/define_application_software.pdf
    • http://jusibutotesax.epizy.com/nusodewopubibatuloridu.pdf
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_294f1d2ffd3a48809a30a0ced6e486ab.pdf?index=true
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_b0168c87c33846d59921f233813f6799.pdf?index=true
    • http://koluriv.rf.gd/dexup.pdf
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_2d90434c1868473a9cbbc8bc81804cec.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7a.bin
35f5ee269c58b29a6a9066f6bf0e35f7c6b55ee4da6ec38aa1249f15c333d87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 5624 bytes
font_01_sfnt_off0001007d.bin
c6270f644229107e72630849453edaec91978095b4504fac6d7ff87c31a14691		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 11476 bytes

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