Malicious PDF — malware analysis report

Static analysis result for SHA-256 0100e44f2720f138…

MALICIOUS

PDF

88.6 KB Created: 2021-02-15 12:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ac0077adfee59f3739a3bc90e2687efb SHA-1: 31fd16e98f699876291b104217dd9101899d4e9c SHA-256: 0100e44f2720f1380cd85b0ef409e90cdf1cd0ba3b4ab82ebbdac7aeeaa8b8df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to manipulate search engine results or lure users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=bleach+mayuri+kurotsuchi+perfection+speech PDF link annotation
    • http://gratoram.site/jj_benitez_caballo_de_troya_8gfmg7.pdfIn PDF document text
    • http://cosmosqrab.online/measuring_units_worksheet_homeschoolmath_answer_keyo4nst.pdfIn PDF document text
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/8162477.pdfIn PDF document text
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/c55482381.pdfIn PDF document text
    • http://vomuniwawan.iblogger.org/antenatal_care_who_guidelines.pdfIn PDF document text
    • http://stroy-level.ru/adding_integers_worksheets_grade_7afknw.pdfIn PDF document text
    • http://kostlike.site/56628445413alpv1.pdfIn PDF document text
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/pokuguvomujativ-zunawizodab-gawojos-rotujakiwiwat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jefazaxal/76205705574.pdfIn PDF document text
    • http://gavutubawoxin.epizy.com/6408763518.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/cisco_webex_free_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/vojesalenuxemovi.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/72572095808.pdfIn PDF document text
    • http://nuvipapijulabu.epizy.com/sirejovupujulutuwetolido.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_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 5352 bytes
SHA-256: 5d86f5c19b5ef77306f21b609010df524f56212884c0c5c5021776aa2bbd51d8
font_01_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 10392 bytes
SHA-256: 7bee45559e5d5241df4505e2523452d304a2bec08797d2feeecf41141b6da9dd
font_02_sfnt_off000146e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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