Malicious PDF — malware analysis report

Static analysis result for SHA-256 99554524a58584b6…

MALICIOUS

PDF

64.2 KB Created: 2020-11-20 17:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ee663d562d97d78d4cb95846d7fa24ad SHA-1: 93863ce822e69787f84d3205bf5b78276940510b SHA-256: 99554524a58584b6d418506b5559b5cbace2d75d504adca829b44a09286028d7
194 Risk Score

Malware Insights

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

The file is a PDF containing a link to a known malicious redirector, identified by multiple heuristics and ClamAV. The embedded URL `https://cctraff.ru/123?utm_term=another+word+for+agree+with+you` is likely used to redirect the user to a phishing site or to download a second-stage payload. The ML classifier also strongly indicated maliciousness.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=another+word+for+agree+with+you In PDF document text
    • https://xenofoko.weebly.com/uploads/1/3/4/7/134735933/jofuxetokigofaf.pdfIn PDF document text
    • https://mojekofodu.weebly.com/uploads/1/3/4/6/134673543/vajagonogufe.pdfIn PDF document text
    • https://kokurakigid.weebly.com/uploads/1/3/4/8/134866761/zajixamaxagutulekavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fa48e1621956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459791/normal_5fb31c96a3b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5f8af1a0c754a.pdfIn PDF document text
    • https://falerelijiwega.weebly.com/uploads/1/3/4/6/134612416/femaxu.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/fdbc8e04-1c6f-427c-9c30-888f90679e54/zoronegapifakilub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e35e8d-29d3-4185-a7c5-f5f9c61f9689/43696514476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31711ab-76eb-46a4-a109-c536324991ed/gafuxawajuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18569dc6-fbaa-4ad2-b7e0-a86000481268/rapono.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_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 5144 bytes
SHA-256: b35092a1788d576f7b47b98d4f3f509c2e6c63e6e1814af09d2af5300b6d949c
font_01_sfnt_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 10352 bytes
SHA-256: 1dd540b437e127a1f41cf0a497b370db7485a856b36df3028a2b6d1d932f82cb