Malicious PDF — malware analysis report

Static analysis result for SHA-256 66375d78f070e630…

MALICIOUS

PDF

78.1 KB Created: 2021-03-04 09:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 03df8a5d4b4cd4d49345bfd41b2641a1 SHA-1: 9b75e2fbcb88de67ff65a8bdf9c7c97db7ca5045 SHA-256: 66375d78f070e6300d0dfc0d4e356c5bbb8f6e4a3364dce50276c6cbd7ad35c1
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 PDF files on various domains, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for further exploitation.

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://fokemale.ru/award?keyword=the+wheel+of+time+cast+reddit PDF link annotation
    • https://fekubikutoji.weebly.com/uploads/1/3/4/1/134108901/289004.pdfIn PDF document text
    • http://atomyimperial.ru/truck_driver_salary_in_nycp5pjm.pdfIn PDF document text
    • http://domavera.ru/46475499426a6i4d.pdfIn PDF document text
    • https://temeromaxuzi.weebly.com/uploads/1/3/4/7/134745627/2583868.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/latujigufoguroxiluz.pdfIn PDF document text
    • https://kubududowu.weebly.com/uploads/1/3/5/3/135349078/ratagaririgek.pdfIn PDF document text
    • http://winsbig.space/prayer_guide_for_all_souls_dayr1iif.pdfIn PDF document text
    • http://womotov.22web.org/kuwunudijunesipuzotu.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/suzixegazunow/cambria_math_font_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/dodafaga.pdfIn PDF document text
    • http://zaximibirada.epizy.com/acorn_taxi_insurance_formby.pdfIn PDF document text
    • http://medexode.atwebpages.com/stretch_out_strap_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/risk_management_plan_template_for_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/duzajuwuxaviri.pdfIn PDF document text
    • http://pajiridi.rf.gd/are_maytag_washers_still_reliable.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/wavemukuvipujulupaso.pdfIn PDF document text
    • http://jafigufukuwixo.rf.gd/sahih_bukhari_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/99365694606.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_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 5304 bytes
SHA-256: b863119203870ae7ea66bc09a9e3d0f8225be562e9790cfe39ab4aa54b491e45
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 11060 bytes
SHA-256: f312ef8e155cb8f792ed7717b8733d6bb404d81097b75606e3252d689e14464c

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