Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6be3967026ccfe…

MALICIOUS

PDF

90.6 KB Created: 2021-01-18 16:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fc4a90c52e368f3f78f64d8e96a77e14 SHA-1: ba9a018e9dc505b536af70238cdfde5f0206404e SHA-256: 8f6be3967026ccfeaf61646facd784468587d3c2909b3b3d5886b502d9d85d42
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a link to known malicious redirector infrastructure. The PDF also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. No scripts were extracted, but the presence of malicious links indicates a phishing or redirection attempt.

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/123?utm_term=the+kiss+of+deception+book+3 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_600498478f90d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483624/normal_5ff6254c40938.pdfIn PDF document text
    • https://site-1171825.mozfiles.com/files/1171825/cartelera_cinemark_ecuador_mall_del_sur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_5fc27f43938a8.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/veduxisazinugivivekoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_5fb969eaa9f6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418381/normal_5fecb981b79db.pdfIn PDF document text
    • https://site-1191130.mozfiles.com/files/1191130/list_of_antipsychotic_drugs.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/gisegutibakasetajipi.pdfIn PDF document text
    • https://site-1177263.mozfiles.com/files/1177263/gaceta_oficial_de_cuba_aduana_2017.pdfIn PDF document text
    • https://site-1168101.mozfiles.com/files/1168101/pazaxogusojoxolononabel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387244/normal_5fa83e4acda42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492580/normal_5fe439425d123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5ffb4cb67d5bc.pdfIn PDF document text
    • https://maxubuzidam.weebly.com/uploads/1/3/4/4/134486229/05a30e066c65.pdfIn PDF document text
    • https://site-1259053.mozfiles.com/files/1259053/5163671387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 5220 bytes
SHA-256: 5fd1bf67858f833932e19d518432d98ede7bb3049d3a87671c3c04f89bd83899
font_01_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 12764 bytes
SHA-256: 3a9905ad43dbe1c78612ec4ee5c71428a508b4d83ebd7ae1068348b75b15da90
font_02_sfnt_off00014824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14824 16164 bytes
SHA-256: a894b2a58ea94a22d72917c3fe7ce1d02aac4ce6114da251245bfe6cd833a185

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