Malicious PDF — malware analysis report

Static analysis result for SHA-256 7523d4a925e5b7ce…

MALICIOUS

PDF

80.2 KB Created: 2021-04-25 12:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a615d9d56e1e2ffb88aaff0612c7cf3d SHA-1: e1aeb2a30e40c5685980ad029ef91cb288aa5abe SHA-256: 7523d4a925e5b7ce039794f7afce82479cce2c6e42fc4dd1760161f4e2497c56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=2009+ap+language+and+composition+free+response PDF link annotation
    • http://nugotokilovol.iblogger.org/16787387032.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/2114710.pdfIn PDF document text
    • http://parhelifrl.space/metuxegagekazjp78j.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/ce7ec678260930d.pdfIn PDF document text
    • http://pofepan.iblogger.org/79665145037.pdfIn PDF document text
    • http://nextauto02.ru/do_kai_and_cinder_end_up_togethern6jv0.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/652586.pdfIn PDF document text
    • https://zanirifut.weebly.com/uploads/1/3/1/4/131407922/korevidujuwup.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/71221950185.pdfIn PDF document text
    • https://cdn.sqhk.co/nepopagugela/aiithjK/59107249960.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/vivufakunenezawur.pdfIn PDF document text
    • http://skywonder.space/lobiwixumaxetubupepo3dee.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/IOgfxhi/tikakekawifutimosabax.pdfIn PDF document text
    • https://geguwuwivoloko.weebly.com/uploads/1/3/1/6/131636947/9907264.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/jgJqihK/1227253793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexugemo.epizy.com/paytm_apk_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/spider-_man_2002_video_game_for_android.pdfIn PDF document text
    • http://wadobenozunon.rf.gd/28169654201.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/electronics_projects_ideas_for_engineering_students.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/taber_s_medical_dictionary_apk_full_version.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.pdfIn PDF document text
    • http://midetimekewawa.epizy.com/cateter_venoso_periferico_definicion.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_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 5812 bytes
SHA-256: d865e2690c7d2d75b942131c9f57ce5abb81bd947761f9d83483ead2a95683ef
font_01_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 11108 bytes
SHA-256: e46ee81159ccd3c0c264c84e40e21def9fe762be1e13a0315b9765269a9ba441

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