Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa4d94023fc0a70…

MALICIOUS

PDF

79.9 KB Created: 2021-04-11 14:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a04778d57ddcad5c416e64df6ce5e558 SHA-1: e3882a4e8ca0ef01c50bea2e6e890ab21858685a SHA-256: caa4d94023fc0a709f82f25adb9bc0d32b585369b53778b11d326f3f7fb69e1f
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 are likely part of an SEO farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=oedipus+the+king+summary+shmoop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416331/normal_60257e2b23c6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fc91d99d1635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_6062a06118cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_60229effb590e.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/tejuvonixag/java_spring_annotations.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/89699598912.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_bd6dce65ed7c4850a63b15a53eaba6b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a16c06-631f-494d-9a70-a3b017a4d7b9/bissell_crosswave_pet_pro_multi-surface_2306a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aba4232-c4c5-4144-8ac9-5ac418d92754/huffy_bikes_20_inch_boy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e77889-c61b-47bc-a608-84ed461aa3b8/sogusimenekikat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988bd9ca-2f3c-4293-92c6-b2060a643ca8/radical_acceptance_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/john_deere_x300_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/2055634522.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/621074331.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_8efd165a2ed14aa0bbf9599cf2052c7f.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_ef780d36dd7048f2b08c7e6c2d834e76.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_34e3dd162d574252a740d67c2bf0c98c.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_20d94fef6f0a49f28aea7835dc8d9a24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/41588046540.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/2000_7.3_powerstroke_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/electron_energy_and_light_pogil_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed788425-0589-4d8c-9412-5871334ddf65/susitudiwoxosefugo.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_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 5536 bytes
SHA-256: 689b4c45cf48ab51bfd05616c137386d16dda02bfce7e77ebc396879dd73b0fe
font_01_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 11820 bytes
SHA-256: 5a14d1d5330fd1cd0f62b9b3a3deec44b90c6006a05685e28bcffa574b711bcd

Open this report in the interactive analyzer, or submit your own file for analysis.