Malicious PDF — malware analysis report

Static analysis result for SHA-256 5531b36b5b08ad0c…

MALICIOUS

PDF

77.1 KB Created: 2021-03-27 14:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 013d3322210e04dcd380bb3dc606e76c SHA-1: ff0629bac94292af8bf91b892f1896fcdb5c6b5f SHA-256: 5531b36b5b08ad0c0eace00bc15b80dfb73159c48405a3b51d1f49775a800a28
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL being https://pelibifir.ru/award?keyword=adjektivdeklination+test+pdf, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially misleading text, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/award?keyword=adjektivdeklination+test+pdf PDF link annotation
    • https://cdn.sqhk.co/gixofusofago/ifhiger/99327488431.pdfIn PDF document text
    • https://cdn.sqhk.co/redupalulaxo/whjijDb/vutonuf.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/jfAL0qF/call_of_duty_warzone_update_time.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/m1Ejhgi/49232822745.pdfIn PDF document text
    • http://sarumusud.iblogger.org/86157065856.pdfIn PDF document text
    • http://xalebiru.iblogger.org/50023517112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomuxisopu.rf.gd/alelos_mltiplos_exerccios.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_eee0df5cc8804a579121d0b2bc684f2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7561ad36-43d3-4049-8c9e-7ce26b453255/10121191077.pdfIn PDF document text
    • http://rabudigika.rf.gd/63534835615.pdfIn PDF document text
    • http://fosatuzosi.epizy.com/punono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291ead76-10c7-48cd-b015-cec1e2ec17ab/moon_river_guitar_chords_in_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004c062a-dc5b-4a6b-980e-9904db7c1de8/reflexive_verbs_french_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16ec932-6d75-41ac-9c5e-5bee49504733/32093526373.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_5d47e3c08f7f44be92e6a7a3baabea86.pdf?index=trueIn PDF document text
    • http://teporududa.rf.gd/las_medias_rojas_emilia_pardo_bazn.pdfIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_a0572f59801e41f484429c26818ae213.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_e255734e7a12467e9dbf2f8d56b7dc01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/095c7498-b4d9-4150-8b75-a13d4cf80305/lightning_thief_musical_cast_recording.pdfIn PDF document text
    • http://mebolunene.rf.gd/80498086486.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_1f47ef6ca2b146bb898e80e8f7934f2f.pdf?index=trueIn PDF document text
    • http://bifezuragumizi.rf.gd/dna_replication_practice_worksheet_answers.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_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 5128 bytes
SHA-256: 23e8de7ceb75200810673e30125f3375d312076fcf6eab224a4ea9d5afe0ab8c
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 13280 bytes
SHA-256: 9caa97f81be1e18e7748ed09f0542e0f74fe879b7eade38708fd2fcc8dc779f0

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