Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f20e211dd9cf606…

MALICIOUS

PDF

80.3 KB Created: 2021-04-18 08:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 020050835ed7c9ebfa6c089de78c174e SHA-1: 23c16507ecf33aff82ecdc40c4b40e1b5e26bf78 SHA-256: 0f20e211dd9cf60695c2d269461cba29c7555f222190075d741f7c285f77e00c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with specific attention drawn to 'https://lozipotod.ru/strik?utm_term=von+mises+stress+criterion+example' and 'http://mejumeroxara.mywebcommunity.org/dilusuruzurera.pdf', suggesting these are key indicators of compromise. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using the document to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=von+mises+stress+criterion+example PDF link annotation
    • http://mejumeroxara.mywebcommunity.org/dilusuruzurera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_603b2b7bacc9f.pdfIn PDF document text
    • http://fuzabura.sportsontheweb.net/identifikasi_bakteri_enterobacteriaceae.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/iehg4id/bomb_hunters_game.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/hgggXgd/43683613639.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/jdGVSb0/ralphs_pharmacy_hours_castaic.pdfIn PDF document text
    • http://xadexawufomovi.sportsontheweb.net/woginepelazubi.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/1544947.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/xjghahd/kegaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/jlVjctY/hillsong_worship_songs_2020_with_lyrics.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/zulobegokaketaxazisok.pdfIn PDF document text
    • https://munuliwakubife.weebly.com/uploads/1/3/1/6/131637312/pejotubixugoresiw.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/gufefukiro-wanobutasumida-ranagigapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_603e181d2e048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_602098b38dd88.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/giehMpQ/17485042816.pdfIn PDF document text
    • http://papawugamajube.mygamesonline.org/blood_type_food_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf3419f3-6f26-41ca-bb7e-94536d4c6566/volejefepojexepipowizis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c555490-2b71-4b13-b9f6-85e43df21554/riwuwume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8af511b-abe2-4272-a7e4-08d497b29cf4/dawid.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 5112 bytes
SHA-256: 1e8800463dadf33224ac88c74db1d7ce322ac5b856b829c640ee464e3528d237
font_01_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 12200 bytes
SHA-256: 277372f17df69d9a7e6c98e73879f44eb0df35a5d50d89dd2a42961b01b7e9db

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