Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdaaa954dddf492e…

MALICIOUS

PDF

79.2 KB Created: 2021-01-04 19:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6cc14e7492c7976f8ff2110dea51279a SHA-1: 9ed682ef5965036e7a5ae684fac91f9b73d53fcc SHA-256: bdaaa954dddf492e857016f2ad3a23da436bd8ff169922bd18c29e65a4e354c2
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 is heavily obfuscated and appears to be non-readable content, suggesting it's designed to mask 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/aws?utm_term=boogeyman+wwe+song In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_5fad78ce20203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5f9dae71e6e32.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/2743582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f90ee1e2f027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fbd1122dd329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fe1d3a104333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401985/normal_5fcc2d51b0ea0.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/fozujinaxuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5fe52c49e4b40.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/662e1595-84a6-4109-a50f-decc41c74df2/9494485594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4852e9-22ad-4329-a289-81d9120fbc9b/stairway_to_heaven_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf7a950-6b32-458b-a72a-a0c24d9bb389/gusaviwemavodopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84e6cb1-e6ba-4581-a003-410ea945b612/code_geass_lelouch_of_the_resurrection_release_date_philippines.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_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 5120 bytes
SHA-256: 331da180c5e3ddbd5cba0fcf864ec96a2a38933021dffae532b06b21de7d4320
font_01_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 11016 bytes
SHA-256: e94750ac2633cf3ba3dffeb87ca678bde9d92473e10e6eaa5ac16ceeafdb2349

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