Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c06b4b73e3703a…

MALICIOUS

PDF

121.8 KB Created: 2021-04-07 16:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b24f8cfaca80db529e9ff325f776239 SHA-1: b081a43ebd7d5e6a3c4b2b52950d8f0adda112e3 SHA-256: b8c06b4b73e3703a8ee449831929218216b51b12c3647f35c72bbc39e25db9d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns that leverage SEO link farms to distribute malicious PDFs. No scripts were extracted, but the presence of numerous external URIs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/strik?utm_term=manual+canon+speedlite+600ex-rt
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/6204186.pdf
    • https://static.s123-cdn-static.com/uploads/4489850/normal_5ffcce29bd0a9.pdf
    • https://cdn-cms.f-static.net/uploads/4404955/normal_6017038c1df3b.pdf
    • https://cdn-cms.f-static.net/uploads/4454430/normal_60206d534923e.pdf
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/wawovagigezivogona.pdf
    • https://zilonuxe.weebly.com/uploads/1/3/1/6/131637529/nupubaril-jogedipar-jofasefude-kegowet.pdf
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5fe2b1f60c5ea.pdf
    • http://feedbacrnz.space/disney_princess_toddler_dress_up_trunkx751l.pdf
    • https://cdn-cms.f-static.net/uploads/4407729/normal_600bdfaa6a943.pdf
    • http://dream-stat.ru/depogizesajukipa5uk39.pdf
    • https://cdn-cms.f-static.net/uploads/4460946/normal_605b44db6716b.pdf
    • http://fenellalucynelle.info/givifaxogomuwikozuseze5iyx4.pdf
    • https://static.s123-cdn-static.com/uploads/4383925/normal_6004786187699.pdf
    • https://cdn-cms.f-static.net/uploads/4387806/normal_600f313115fa6.pdf
    • https://cdn-cms.f-static.net/uploads/4457843/normal_605508fa02ee6.pdf
    • https://cdn-cms.f-static.net/uploads/4490377/normal_5fd68d749ce64.pdf
    • http://tonerinkstore.com/uc_browser_java_nokia_x2hx2un.pdf
    • http://usmileofficial.site/file_manager_apk_download_for_android_tviaba5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_b5ae550e8d684889b61b0690bdbd995a.pdf?index=true
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_1a2182b90aa643a2897df96f6a9f194f.pdf?index=true
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_0ad92c83fade4d7dbb668a591ad27921.pdf?index=true
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_f6970c60d1b84c3f8469a054f5cb250e.pdf?index=true
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_fb6ea49380504b0b86ba2a8cce5fc697.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ac6.bin
68ffc113337294c0b4fcc1964deaaa7fea5c2c8989ab91fcbb45ebed3e76eb49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19AC6 5468 bytes
font_01_sfnt_off0001ad7e.bin
3201ad766b7dc0c77d76bfa84c5c5d1d1ed7bd5ec95a63757496170e0daeb8f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD7E 13368 bytes

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