Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb67dc5aef08845…

MALICIOUS

PDF

69.6 KB Created: 2020-11-26 10:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 70af8e15a2c77ab00d884b4284e90dc4 SHA-1: 7b084aa3fb48899ddbb7b11c024ec6f837b51762 SHA-256: acb67dc5aef08845b0454431aad8b101d048edde4f54801cabf5c313433dfd04
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 malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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://cctraff.ru/123?utm_term=gary%2527s+used+cars+egg+harbor+city In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f90330175150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5f8d404012da5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5fab84016da09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5fb2ceb7a6470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_5f96e5ae7ac25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f968a863d448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fad9086c9ea0.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/2570998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f91240a8558c.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/fosalizuzu/car_engine_parts_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/cascading_style_sheets_designing_for_the_web_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/novofurope.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/feretibuvemijosafanakagor.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/17842256853.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/liful.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/riravixedu.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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 5476 bytes
SHA-256: 1979f358f718bc8c5a318da8ce82716ecf6f3c4c457c6709be19368002e5eb00
font_01_sfnt_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 10056 bytes
SHA-256: e966a3b2aa399fd1e55fc1444a2c8f4e7105242d8bc542c7959e6f24a75f4f67

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