Malicious PDF — malware analysis report

Static analysis result for SHA-256 93457a188f4bd865…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 01:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 42b035ce33e54900ceeb687e0bc3e961 SHA-1: cf7eff3592cc02f6f9a82c8e3e57fc21da38bc84 SHA-256: 93457a188f4bd86532d317265e700a4c51b0e230ce8279dff5bd2f26365c175e
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm and a high-severity heuristic flagging an image lure linking to an SEO redirector. The primary redirector URL is https://kuzutuzo.ru/strik?utm_term=what+is+molecular+solid+crystal. ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of embedded JavaScript, though not explicitly detailed, is a common vector for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=what+is+molecular+solid+crystal PDF link annotation
    • https://ludefojixik.weebly.com/uploads/1/3/5/3/135347049/tigamor.pdfIn PDF document text
    • http://bifitiguz.iblogger.org/36762207459.pdfIn PDF document text
    • http://gufutaca6.xyz/fountas_and_pinnell_running_record_templateph651.pdfIn PDF document text
    • http://milansit.space/72376300328qj2ao.pdfIn PDF document text
    • http://talkme-news.info/stick_war_2_unblocked_google_sitesf9d6z.pdfIn PDF document text
    • http://alcexpress3.xyz/2574844818jx5a2.pdfIn PDF document text
    • http://botamasixijo.iblogger.org/49774749023.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/tvs_bartender_software_free.pdfIn PDF document text
    • https://jepukarebav.weebly.com/uploads/1/3/5/3/135321711/a6917c84b9a8a.pdfIn PDF document text
    • https://lamamamim.weebly.com/uploads/1/3/1/6/131606140/xilojevasoxaraj.pdfIn PDF document text
    • http://greenbike.shop/93555705977qlnrq.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/wusone/arrl_band_plan.pdfIn PDF document text
    • http://babupit.epizy.com/atomic_structure_chemistry_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/25017294697.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/dawuwafaketevavipani.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/3877032303.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/catanzaro_informa_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/pisixekinavumajebi.pdfIn PDF document text
    • http://togoraxig.rf.gd/zeviri.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/business_card_label_template.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 5292 bytes
SHA-256: ef584283bc253d6d489cc17359b2aabd02e7a1d490c5d4b834b260a97311b352
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 11528 bytes
SHA-256: 45cb959f5fcda56d113770d8024efca4d0c5eeb0bf25cff467252cd8bd126176

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