Malicious PDF — malware analysis report

Static analysis result for SHA-256 449a7b7ff65ce2dd…

MALICIOUS

PDF

112.2 KB Created: 2021-03-11 22:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f4fb829bbbd24b2c87485f66d213bb7c SHA-1: 26854dfe2ab7eaee06c6dc500d57a1145339498f SHA-256: 449a7b7ff65ce2ddbcd03338f89510d4607742714100c495e3c938042f10a7dd
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were extracted, the sheer volume of external links suggests an attempt to redirect users to potentially harmful content or to manipulate search engine rankings.

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
  • 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.
  • 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://seumenha.ru/award?keyword=inglourious+basterds+original+screenplay+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485576/normal_601d4f098d6d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5fe0d03a7a260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fe670efadfb8.pdfIn PDF document text
    • http://benomudefosopux.iblogger.org/how_do_i_know_chainsaw_chain_size.pdfIn PDF document text
    • https://lipojiwogim.weebly.com/uploads/1/3/0/7/130776075/dc1a31dadfa48f0.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/3861304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_604342737f15c.pdfIn PDF document text
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/fodenubirumake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_6039f1228268d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393369/normal_5fdf131a67399.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/toditurazofudup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ffb94eb44971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384304/normal_5fe10ddbdb418.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/fatikonavori/define_accident.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/761128565.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/13762005305.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/prophet_sport_mini_lipo_charger_manual.pdfIn PDF document text
    • http://fefekug.rf.gd/51806856124.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/autobiography_powerpoint_template_free.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_off00017b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B89 5500 bytes
SHA-256: e8616a0309afd8782aa648c21bbe03afdba1ec7c3276b48486095a8b83a5a4d6
font_01_sfnt_off00018e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E53 10856 bytes
SHA-256: 8258aabfab025193ac4e624db3d538bf52248e27cac2aad9ae835576c3ea8c10

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