Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4ad41086455bff…

MALICIOUS

PDF

68.7 KB Created: 2021-01-03 14:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c23c01b63b304e0b6fcd6538e713c2b3 SHA-1: 9eb26df6c89b323412023ad78517b56197619aad SHA-256: 4a4ad41086455bff4cdde78550c7451d3e250bfeafadbaf4b24e05ee86bbd41c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and a large link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users to external sites, likely for phishing or to download further malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=astm+b117-+18+pdf+free In PDF document text
    • https://jibisovewa.weebly.com/uploads/1/3/4/6/134653871/monifumatabem_zavirup_zujovegabapiwi_luwowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5fa6d59285380.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/igmyGjj/94331221392.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/iije8jb/2567918417.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/hjegfgh/xusarexupujif.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/ggycHha/jowirajakunaguzoliw.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/ihgfNG0/83993642520.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/hhfWchh/smart_goals_examples_for_students_pe.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/goneduzum/lymphatic_malformation_face_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/lab_safety_worksheets_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/android_phones_unlocked_ebay.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/sbi_green_card_application_form.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_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 5432 bytes
SHA-256: 320c4049146726d3b73c5fc169aef19adc0be20f9320d821ed6bd38aee6a1ae6
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 11004 bytes
SHA-256: c2243c1437386cdcd863c934775ec85e0a45e4b269003c2798d05537c2e558c4

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