Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10158e5ccc0d246…

MALICIOUS

PDF

74.5 KB Created: 2021-01-17 17:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7cf3f96ef51e6eb13c85a635509ab720 SHA-1: b89d55c3c769de99eb1c59da25476f506a8c3d8e SHA-256: c10158e5ccc0d24643be6e7a8f71b7cae86aa2d3ebcbbbc586a14152f37986b3
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to suspicious or known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, possibly related to gaming guides, to entice users to click on these 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://cctraff.ru/123?utm_term=warframe+conclave+guide+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8ffd749b2ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_5fd9d8a637736.pdfIn PDF document text
    • https://pakulokopujaf.weebly.com/uploads/1/3/5/3/135389458/bitutufufafedot-sobogalowoze-karexiwaresexe-xunukikamijomut.pdfIn PDF document text
    • http://rolevuses.iblogger.org/34802702272.pdfIn PDF document text
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/5187953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5fdc2941448bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5fcbc04b18f94.pdfIn PDF document text
    • https://gabukoxikala.weebly.com/uploads/1/3/3/9/133997771/kegoli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozibata.epizy.com/mipoworamenijodu.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/graph_paper_template_to_print.pdfIn PDF document text
    • http://vokulokunupada.epizy.com/18264376464.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/rufigubuwenepu.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/54400929128.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/53374825724.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/dusk_till_dawn_movie.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_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 5716 bytes
SHA-256: f7f1d8b1145d56e150f32d6b1480d0a2db6d21b34bd494a3191f652fec7beb5a
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 12164 bytes
SHA-256: 42375f41c924dabb90bf50af93448625ea2095c906ad67d9217ce72be0b60185

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