Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9e04d426868598…

MALICIOUS

PDF

73.6 KB Created: 2021-01-28 11:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dc4aaf5dfbd4628d49d986e8c32129cc SHA-1: 9fde0b8faadca5a1ab6aaf600a2d56b31d6d2b40 SHA-256: cb9e04d426868598e9f8cdce8bef468412fd614335c363c0fa9c49164c1e9007
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or malware downloads. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'T shirt order form sample', aligning with the phishing lure.

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://jottigo.ru/123?utm_term=t+shirt+order+form+sample PDF link annotation
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/9074135.pdfIn PDF document text
    • http://stonersfranchise.com/4527431730136ug6.pdfIn PDF document text
    • http://adv-workshop.site/zaxawojuwuwoginekamebir88sk7.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/jc0Ije6/pluto_retrograde_2020_meaning.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/dimulibotonos.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/34aed0b4d.pdfIn PDF document text
    • https://cdn.sqhk.co/rapalaxob/zieiilv/spacex_crew_dragon_demo_2.pdfIn PDF document text
    • http://hookup671.site/business_boarding_up_before_election49dr9.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxifopu/jfq5uif/kolirulusokamep.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/gogonof/penfigoide_bulloso.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/55592412448.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/bihar_police_si_syllabus_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/rimowad.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/citroen_grand_c4_picasso_manual_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 5228 bytes
SHA-256: 75e7663d5a21b52dee011bc54eb17971ffc9c2f46b07e60be20d0db8fa2224d5
font_01_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 1832 bytes
SHA-256: 1bf39900b6225532f5cfe4e5f84ab3c4c7b0e90638e281f24f415d3fe24ed3f8
font_02_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 10200 bytes
SHA-256: de5ab9d21a3a21deed055860390ba43a16971dbd4158bda9d8365bcdfadb99b4

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