Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5457fd7edbdd8f…

MALICIOUS

PDF

75.1 KB Created: 2021-04-12 21:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 99eade46177f4c792522e572dfe3ef40 SHA-1: 553fe171a479c0f753bb32419bd00a75745aea01 SHA-256: 9e5457fd7edbdd8f60433406fa2e830ac91b0bffb8c07edc8c142273c3bb50e4
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to domains commonly used for distributing malicious content or phishing lures, such as 'resalured.ru' and various 'weebly.com' subdomains. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO-based malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=idylis+air+purifier+reset+filter+light PDF link annotation
    • https://tavazefemaxi.weebly.com/uploads/1/3/5/9/135966092/notazifizuse_kefuxipadin_jixeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_604e99485d936.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/veruzofu-lusodaguxiluxix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fee28e1a522f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_60584c7114283.pdfIn PDF document text
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/259e1.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/2dhbihV/sineke.pdfIn PDF document text
    • https://pitalozel.weebly.com/uploads/1/3/1/3/131384414/aa2007395ce.pdfIn PDF document text
    • http://bapitafi.22web.org/81116138002.pdfIn PDF document text
    • https://jetukuzimol.weebly.com/uploads/1/3/2/6/132695660/kemurirerujog.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/2665046.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/9976598.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/kevaxejad.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/1935011.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/human_anatomy_and_physiology_all_systems.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/dlBbOWp/24026941145.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/joxoguvisejatukowazulokiw.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/lapakebabilula.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/roladuwora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_6028148383e74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopenakonaj.rf.gd/when_to_start_tomato_seeds_in_north_texas.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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5344 bytes
SHA-256: 7a5bf2ebe2fb1b5729820fa44e1fa1b70f42d875eb5b509eda42540b821eeafe
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10924 bytes
SHA-256: fed5fb94c425f9f965186210a07c16532d7546755f815daba38640bd8d49c283