Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f40d1bc3af2c15…

MALICIOUS

PDF

73.2 KB Created: 2021-03-28 18:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ddf0d18d1f901eae56c363c846716d9 SHA-1: d5a3c976b5c4f7de13321dcca57f8973cd637780 SHA-256: d7f40d1bc3af2c1574b63a81b65dd8922b9fae1e778c79188071f5e3c9e34fdd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and link farm nature suggest it's designed to redirect users to malicious sites, potentially for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=adjectives+worksheets+pdf+grade+5
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6025969b55af4.pdf
    • https://cdn-cms.f-static.net/uploads/4489033/normal_605243fe49d23.pdf
    • https://static.s123-cdn-static.com/uploads/4460680/normal_6003471c964c9.pdf
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/4185845.pdf
    • https://static.s123-cdn-static.com/uploads/4446937/normal_5ff2bf503eefa.pdf
    • https://static.s123-cdn-static.com/uploads/4386091/normal_5fe3de0e053ce.pdf
    • https://xarojitoma.weebly.com/uploads/1/3/5/3/135305856/bowudamuj_mogulofo_zepep.pdf
    • https://cdn-cms.f-static.net/uploads/4369516/normal_601f80312b521.pdf
    • https://cdn.sqhk.co/metexemoraga/SujjBGR/battle_for_wesnoth_campaigns.pdf
    • http://topitoxituzoju.iblogger.org/beginning_node._js_apress.pdf
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/gibef.pdf
    • https://cdn-cms.f-static.net/uploads/4392664/normal_601837bae60b8.pdf
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5fec059ded96f.pdf
    • https://cdn-cms.f-static.net/uploads/4417414/normal_600f4a6d3bf77.pdf
    • https://cdn-cms.f-static.net/uploads/4405208/normal_600df7e4d4dbc.pdf
    • https://cdn-cms.f-static.net/uploads/4417834/normal_604ccf91c3b37.pdf
    • https://cdn.sqhk.co/luwukamuku/ihbOSwu/fexurolijufelobaxituk.pdf
    • https://cdn-cms.f-static.net/uploads/4487647/normal_603f9b1a2fc92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuzivamozevimi.epizy.com/wedding_march_partitura_piano.pdf
    • http://kusuganuxe.epizy.com/75764704962.pdf
    • 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_off0000df49.bin
adae530ef4462363049df4e05a79f5bdc42b0621ab0a03ff0e62e7a81b9507c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 5792 bytes
font_01_sfnt_off0000f31b.bin
885182cd909e7ca26bd6af29ce67fecadd4905ddd8971564795fdd892d21310e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 10668 bytes

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