Malicious PDF — malware analysis report

Static analysis result for SHA-256 d337ba7a1ecd47fc…

MALICIOUS

PDF

71.2 KB Created: 2020-12-31 06:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a33fb79cf8962bf0abf17201c5a7e089 SHA-1: 897f2d5b4da9db11973a35eec2b0aa371c3d2a50 SHA-256: d337ba7a1ecd47fc65f5320cff10f2209807f5c4b67b7338c7bcb24cfda04169
214 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially obfuscated, contains text related to academic statements and software versions, likely serving as a lure to disguise the malicious links.

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
  • 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://traffking.ru/123?utm_term=in+1998+the+american+anthropological+association+issued+a+statement+on+race In PDF document text
    • https://cdn.sqhk.co/lexuxeza/hgtHjiD/kirudoxegumibuzejolavod.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/D5jfihr/light_up_mirror_bathroom_battery.pdfIn PDF document text
    • https://vokugovu.weebly.com/uploads/1/3/4/5/134598923/550f3.pdfIn PDF document text
    • https://cdn.sqhk.co/piwixesiwufo/doggfjd/ruwasawomirazurapesogod.pdfIn PDF document text
    • https://wunimebi.weebly.com/uploads/1/3/4/3/134361225/luvopibe.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/musitofaferej_ruzar.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/ftRR3jb/tap_tap_fish_abyssrium_pole_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a069e0-51be-4d91-88b8-0e7a4e53af1d/vupoko.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/5175346851.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/excel_sum_of_different_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766cabb2-5128-44bb-992a-27ee0f38b1b7/cleric_5e_domains.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/36342649843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90bcb4d-24b9-4519-90d9-5fcceaaa4a53/login_guideline_for_2011_entry_students.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/2908590215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7a81ef-9f14-4b20-b8b5-74b5a5a69eb7/pigopudaw.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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 5824 bytes
SHA-256: e515ec86d1cda9f33eab9ede43003b33ea09ddc8372397a83a0898bc1e3be647
font_01_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10564 bytes
SHA-256: bd65252b6c1e6f551f1e451e690a51818b492b4a2987db9d2d0a9c414f092734

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