Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8104bae09f8c97…

MALICIOUS

PDF

62.2 KB Created: 2020-12-24 22:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6fed83343ff3929e98b1ff0721a153d5 SHA-1: 864c23777e6527a1257274f8284adc99053d2b2b SHA-256: 2b8104bae09f8c97a029189ce492e01243fb0d817872d08b6bc934fe7b8aedad
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic firings indicate the PDF is designed to link to external content, likely for phishing or malware distribution. The presence of numerous PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/strik?utm_term=ralphs+pharmacy+lincoln+blvd+marina+del+rey In PDF document text
    • https://cdn.sqhk.co/jesisuvov/fqhfijh/74158638839.pdfIn PDF document text
    • https://cdn.sqhk.co/rotogogoji/lagd2Il/trending_videos_download_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/F1hhShe/25058987131.pdfIn PDF document text
    • https://tasibitasu.weebly.com/uploads/1/3/4/5/134530233/1048010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fdc36cd38ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f946257e0b33.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/hbhi3qG/fizimisogul.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/follow_up_on_unanswered_meeting_request_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/97870906336.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/body_language_facts_information.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/electrocardiograma_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/konditionalstze_franzsisch.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_off0000b562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB562 5624 bytes
SHA-256: 59c7dec332b4e1934f357a8f4a6392d7d3006c4b4b993a7a77d15e1af021fb44
font_01_sfnt_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 10516 bytes
SHA-256: 2dec6d0e0054074348f02bd3a43f363be5ce10d04067d85ac893672a39e3dcc2

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