Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e33993e7a77e0d…

MALICIOUS

PDF

65.4 KB Created: 2021-02-21 12:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d58d18556bdf412384e56386f302eaa2 SHA-1: 7439f43c53d303f31a401bb14268aa98c9aaf3aa SHA-256: 04e33993e7a77e0db5aae0751148c7ee9db9c051dc7aba4e09444468c981b5d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=kenmore+ultra+wash+dishwasher+maintenance PDF link annotation
    • https://mizabago.weebly.com/uploads/1/3/5/2/135299272/pasunobawowevij.pdfIn PDF document text
    • https://futafapegimato.weebly.com/uploads/1/3/1/8/131855997/remila.pdfIn PDF document text
    • https://cdn.sqhk.co/mapiwoda/DbEvMge/stick_cricket_live_2020_cheats_ios.pdfIn PDF document text
    • http://stopnutristrike.ru/download_spacedraw_key_free6cj9q.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/jojejaxik.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/djiPLtZ/dulisikewesajisiri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzarog.rf.gd/xowinik.pdfIn PDF document text
    • http://xobofob.rf.gd/blomberg_heat_pump_dryer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/assassin_rogue_guide_bfa.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/windows_10_disable_mouse_cursor.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/khasi_funny_videos_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/cgp_aqa_biology_a_level_revision_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/reported_dog_bites_by_breed_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/la_anemia_falciforme_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/bavajumun.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_off0000c332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC332 5240 bytes
SHA-256: 467ae008da3c57085bbf7fd6478bc986db601276d415adc070f9e3e8ef78b4db
font_01_sfnt_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 10364 bytes
SHA-256: 73713bb73fd4b397248c487839fb874476a81ee922eca9e31f11fddde6baefdc

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