Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bebda944fc76e5…

MALICIOUS

PDF

81.3 KB Created: 2021-05-26 06:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 23430590b198d4a55dc94e22208a7fc5 SHA-1: 218013939e14e8be333608774b238970e26c401c SHA-256: c0bebda944fc76e54c2b048805d7b9f21971ff1aa03df5d06cae72ab66439693
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, with one prominent link pointing to 'jacksth.ru'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'networking protocols pdf' and 'wkhtmltopdf', indicating a lure to disguise malicious intent. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards an initial access vector via spearphishing attachment.

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=networking+protocols+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fcf218e6e362.pdfIn PDF document text
    • https://sokevabo.weebly.com/uploads/1/3/4/6/134665749/7413115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5ff779ad77294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366306/normal_5fdef0e829b83.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/d046f88f75d5b24.pdfIn PDF document text
    • https://zurudepovog.weebly.com/uploads/1/3/1/4/131438860/3408337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wekibik/symbols_emojis_letters_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/zagivut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6333507-95b8-4225-94eb-f3bb3e0a8066/rolor.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/how_to_use_attachments_on_cuisinart_food_processor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1b8d7c-bf0c-46e8-acbd-d8f6e4df6eb7/17510315700.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/harry_potter_weekend_freeform_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5500a9-e52a-43d3-a79d-bdb4dc65d0b7/tudifapigisivuxaxisexile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c336f7-86d9-4d4c-8d51-72639971a3c1/which_nikon_cameras_are_dx.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/inspector_general_s_report_on_solarwinds.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/dwarf_fortress_beginners_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/41705001978.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/watobojobupivapituwur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1565ebc-6b5c-43af-badf-34eb7a2dae5e/64526563287.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/dd_warlock_subclasses_homebrew.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_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 5240 bytes
SHA-256: 0bbb4b8988cb58eb9cbc71b3d5942b897d4febb06368cc284435bd0cf5e91d68
font_01_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 10556 bytes
SHA-256: 98be924a016a677f3b1f09a7cdfa85c796725203760af0d1ffda908f3d6a1394

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