Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb91567b9a748dbc…

MALICIOUS

PDF

86.1 KB Created: 2021-01-11 19:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9f6fe90feed88c24ed18cea1c70c1161 SHA-1: 31052255ccd1e6a00baf93222c8121b342e1f348 SHA-256: eb91567b9a748dbcef7a74a99de8aaf6314ddad79739cd26f8068d7ce57eed84
214 Risk Score

Malware Insights

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

The PDF contains numerous 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 heavily obfuscated, suggests a lure related to an 'exam answer key', likely a phishing pretext to encourage link clicks.

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://ggtraff.ru/aws?utm_term=dsssb+exam+answer+key In PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/zejedexikejinakogake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_5fa66bebb4185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469849/normal_5fc5d4b5507d8.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/fawizulixijotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5fa00aec27218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481673/normal_5fe00f16721b6.pdfIn PDF document text
    • https://site-1178374.mozfiles.com/files/1178374/96525468802.pdfIn PDF document text
    • https://site-1172709.mozfiles.com/files/1172709/26362355128.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/9ad8a344.pdfIn PDF document text
    • https://site-1179563.mozfiles.com/files/1179563/lunuboliwivaxikivepilibix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464734/normal_5ff021c92394f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fe985072f59f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491439/normal_5fc8e2b787796.pdfIn PDF document text
    • https://xopezafetuwov.weebly.com/uploads/1/3/5/3/135314897/1031676.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/sumesawoxajew/dowim.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_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 5264 bytes
SHA-256: cc4d8e7042c9d13505335e633aa57b1d05301873162068091b7bff0405f4edb9
font_01_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 11352 bytes
SHA-256: a6be0b6ce398e6c80daf46a450ea1a23241490964b02d51b97a659f7c610652e

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