Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ffe4db40597f36…

MALICIOUS

PDF

75.9 KB Created: 2021-01-26 13:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b1f4f3634b340b0ec09407f1337792c SHA-1: 258db6262c764477854128edfde35bc7071dde59 SHA-256: b8ffe4db40597f3694f76ab8692473b0f2b4d5dcbe455265be87bad13f0a44aa
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'Infinity War comic ending'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many pointing to PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=infinity%20war%20comic%20ending In PDF document text
    • https://static.s123-cdn-static.com/uploads/4501645/normal_5fcdaf9a5a97b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5ff47df475be2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405414/normal_6000d7fdad40b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489263/normal_6001132478155.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/Nyelhf8/gudefojevedezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417408/normal_60003625eda82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fcbd645955d2.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/EgdGjhD/samsung_payment_services.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377115/normal_6001d3d7eca07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475376/normal_5ffbfb8a81385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_600b3edb35028.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_5fec09cb7b77a.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/ghijhbq/86025100021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455178/normal_5fe0c3003c5bc.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/egigh9H/81506590619.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/girinewejedaranawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_5fd0a0fa8a679.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/tesotiwapax/15012920560.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/82451477487.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/fililekiviw.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/jepurukogogib.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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 5260 bytes
SHA-256: b17e03e1daf2dee12b3e63cb9de1ca4773ee964865f56d1f4683334114a45097
font_01_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 10936 bytes
SHA-256: 0c064745b52033492e118d667d3854beaf2c081ef4c1965dbe88046f2da8485f

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