Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0c7af2f68af87f…

MALICIOUS

PDF

76.6 KB Created: 2021-01-09 18:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ce92d6a62ab7fa22dd662f69c650cab7 SHA-1: 922de643eaf65fc62057ba25361ff54fbb71e91d SHA-256: ba0c7af2f68af87fa1f026623fa94ba4aa04b08d6a0bee1ae2d2bc84ce6508e4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to link farms and potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the structure and heuristics point to the document being used to drive traffic to malicious 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://traffking.ru/aws?utm_term=sine+wave+equation+pdf PDF link annotation
    • https://lowujowe.weebly.com/uploads/1/3/5/3/135320741/09ec9f1.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/jg7K1oj/lejepudipagilif.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/bmxqghD/toxozapalax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fdddd498e34d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480142/normal_5fe16a8a44615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7982ab-06ba-4d96-8e07-eacfde7e05cc/customer_success_manager_resume_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/utilitarianism_mill.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/grange_primary_school_harrow_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/kayn_jungle_guide_german.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718b29b2-dcff-4850-9ec1-cd99d4e5b806/bizixanufewupojob.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/4816729495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3019943-a468-4ba7-8270-ee14b2001452/fopokejadonavibibu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 5108 bytes
SHA-256: 06918e44ea1f5c9806505fca7b56c8286d42abc6df0f01e24859e713d873b977
font_01_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 11932 bytes
SHA-256: 4c44c09f593b82e976397b2c09855214dfc198ae745f8c4586507b7b54c68dfb
font_02_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 16112 bytes
SHA-256: b01ebfb3c128057002ee400f117ac318a58e3fa7adc5d6d2b859b116fef82aee

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