Malicious PDF — malware analysis report

Static analysis result for SHA-256 8337ebbd1d955005…

MALICIOUS

PDF

74.9 KB Created: 2021-05-08 16:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bfed0796943c39296fd967361f050e54 SHA-1: 249392c216204b670c4c8a6fef9b83a948501218 SHA-256: 8337ebbd1d95500595302d425afc4c0aae15641e04779abbecfc3ce45f739ba1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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://golowaki.ru/strik?utm_term=the+story+of+edgar+sawtelle+reviews+new+york+times PDF link annotation
    • http://fafijitesulexiz.mygamesonline.org/tonidogunowi.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/0iihghc/xovuvobub.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/X07E0jc/bloomscape_carnivorous_plants.pdfIn PDF document text
    • http://nupufuzomofima.22web.org/arm_a32_assembly_language.pdfIn PDF document text
    • http://taroburi.iblogger.org/49294151874.pdfIn PDF document text
    • https://cdn.sqhk.co/falugojafat/gZghhcF/zero-_day_attack_definition_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/hi44hi1/81650438823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepatodop.onlinewebshop.net/sensory_evaluation_form.pdfIn PDF document text
    • http://wagovadi.rf.gd/29146995492.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/harry_potter_lego_sets_2021.pdfIn PDF document text
    • http://fejukuvazov.rf.gd/asphalt_mix_design_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/us_army_rangers_badge.pdfIn PDF document text
    • http://vanobibufasapes.rf.gd/85552511708.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/lirobaxiwunudu.pdfIn PDF document text
    • http://feribejelabini.rf.gd/ninja_blender_instructions_auto_iq.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_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 5588 bytes
SHA-256: 7f0b902ed719f1a852a11547aeb99ddfa83ba75afac66101c9b42be543f562ee
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10396 bytes
SHA-256: a7a589992f6d0b6b5739dcc0e8fc912ab6aaa39fcb317c0d85598b0e8fec4d2e

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