Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2e0f1c76d9c27a…

MALICIOUS

PDF

75.6 KB Created: 2021-01-08 22:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8226d96cced8ae9c20c9f9f8eddb3d17 SHA-1: 7448a6a419c109020935c879c7f39362295d8f28 SHA-256: 4a2e0f1c76d9c27a99df99f947ff7bcd6a21529b98ca8dd7488e6f5cd5295b5d
214 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one URL redirecting to known malicious infrastructure. This suggests a phishing or scam attempt designed to lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=mr+christian+kenfield In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5fced49ac775f.pdfIn PDF document text
    • https://feruzizujuvete.weebly.com/uploads/1/3/0/7/130775768/6722789.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/lijonibakakozikoxu.pdfIn PDF document text
    • https://revejoduxu.weebly.com/uploads/1/3/4/2/134266419/moxamoxosumi.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/d2360d3f4f928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fde86e35e71d.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/hiOghcp/sagokiwo.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/tapexiw/bootstrap_form_validation_checkbox_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/61529543942.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/92584857502.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/buwelesisafoxusanexizexof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14fd389d-932c-428b-95f9-ce00c0081191/25820090117.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/used_balanced_body_allegro_reformer_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/ice_hockey_stat_sheet.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_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 5176 bytes
SHA-256: 71ee34bcc70211ce86ef9553c105fc49d198e72004d088649630ee5290b40229
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 10968 bytes
SHA-256: 3850629d2f425746877fe6896ddd133333d4f3e7a4b827bed767b28fe48ccd05

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