Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f658e91c20c64f…

MALICIOUS

PDF

74.4 KB Created: 2020-12-19 02:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b009107eac69ebfde15b87f85b87a773 SHA-1: 5c25efc0a5de9bb588f7e4f5f3f6d2e6034bc64d SHA-256: b4f658e91c20c64f8e5af6f106020b4b05ee094e54828a3bd124d16a436d4258
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'led flasher light', likely a lure to disguise 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://ggtraff.ru/strik?utm_term=led+flasher+light In PDF document text
    • https://zuxubemusaf.weebly.com/uploads/1/3/1/4/131453996/1a7a7aa2732d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5faed92d27eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5fb4a6d5096eb.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/buwobu.pdfIn PDF document text
    • https://bunewifuji.weebly.com/uploads/1/3/4/7/134709558/suzubafupow_tofix_vejufoz_dumezavijefusul.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/f367cc2f1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5fbbadfb3ef18.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/kulinisokakewi/50170083496.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c729405d5340f34b2a10/t/5fcf89041901dd4d2ed857ca/1607436549585/snow_storm_superhero_mod_apk_hack_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/broadcasting_software_for_windows_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/nugomibenafumofej.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/alkaline_herbal_medicine.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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 5112 bytes
SHA-256: d8231635f46ce837be20636701bda8ae37777c10b8578215ed2bac2b671af1e7
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10380 bytes
SHA-256: cc9dceea07eff8784a87a0c4490e9656d1757e015b5da07ee2f30033510e40b0

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