Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b11cdb27637ce35…

MALICIOUS

PDF

76.8 KB Created: 2021-01-10 03:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2d9e18fd7f803fbd0091266e25771695 SHA-1: 95f51ea751bb2a4098bd53fc73c2e5c9e368c25d SHA-256: 4b11cdb27637ce359812602759dbae95e9debfd3db1ed07c8909e3ffb043c3a2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to S3 buckets and other domains, indicative of a link farm or distribution network. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or facilitate further infection.

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://trafffe.ru/aws?utm_term=acting+auditions+resume+format PDF link annotation
    • https://site-1177229.mozfiles.com/files/1177229/mekiwivupa.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/zodej.pdfIn PDF document text
    • https://site-1173237.mozfiles.com/files/1173237/1158648282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbdef89b2c5.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/xekakosexepajop.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/bifamomove/ca_final_ama_paduka.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/fever_1793_summary_chapter_30.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/glock_buyers_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/84809882395.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/free_marketing_calendar_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/2019_porsche_cayenne_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/tobuko.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/bicycle_thieves_malayalam_movie_cinemavilla.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/spring_jnditemplate_lookup_example.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_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 5300 bytes
SHA-256: 93f4284ee1a050428393c8703e6140dd94c8a93e8a72d5f54dd92c2ad91d1d94
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 10872 bytes
SHA-256: 177f027872b0250ce4d6b76c61575bbb8a815b58cc05b5fcca47020c386abf24

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