Malicious PDF — malware analysis report

Static analysis result for SHA-256 543ec8fba045cc20…

MALICIOUS

PDF

68.7 KB Created: 2021-03-23 13:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 88d5e71d35c7fa9313f2d75cd4f4e68c SHA-1: caf63d33aad80eb389751a44faa94c2ceab91c04 SHA-256: 543ec8fba045cc201295a3dfdbe9717cd1118b43b05910675830702241204d71
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to downloading an ECG manual. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing or malware distribution vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=ecg+manual+pdf+download In PDF document text
    • http://nejesekepub.22web.org/87764107581.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/hj9bAQJ/bingo_live_online_chat.pdfIn PDF document text
    • http://salepid.iblogger.org/photosynthesis_worksheets_grade_6.pdfIn PDF document text
    • http://rezubodojel.medianewsonline.com/que_es_un_cultivo_axenico.pdfIn PDF document text
    • http://vobarijijagurar.22web.org/app_store_please_review_account_information.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/rjbxhbm/cold_patches_for_fever.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/iajjuia/xipoxilolozadivupapopa.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/3201345285.pdfIn PDF document text
    • http://vatemuredaxusob.22web.org/hppsc_answer_key_hpas_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://posugez.epizy.com/doxiwunixisekipoferemen.pdfIn PDF document text
    • http://vopapokolozanum.rf.gd/casavant_performance_organ.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_cbd385f5558b42c8ae3eff5f98674c63.pdf?index=trueIn PDF document text
    • http://fojakosi.atwebpages.com/65175175644.pdfIn PDF document text
    • http://banobozibijur.epizy.com/zadov.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_6dd560358ea8450e9b6bdf2fa7a4f182.pdf?index=trueIn PDF document text
    • http://nozafawuronixe.epizy.com/98909013666.pdfIn PDF document text
    • http://nuvafakidem.rf.gd/96359244195.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/galaxy_buds_spec_sheet.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/459366181.pdfIn PDF document text
    • http://puwolir.epizy.com/gmp_inspection_report_template.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_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 5248 bytes
SHA-256: 104aa8d2e2334f4e423e6739016a820bae2dddde6d505563f91e13740d661db3
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 10684 bytes
SHA-256: 849060483516a16c83aa2de51ccc57f228df251377f223b58b9032d78ea96ad2

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