Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb467baa3b877313…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 02:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aad9a6d04719453f0159c5992c3cf9c7 SHA-1: 2338b00d1902e041149267ccc96a8d4b807e1d51 SHA-256: fb467baa3b877313725bf0b452993d43f7ac1638f4090976947320d59bded26b
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or redirector strategy. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=how+does+gdp+measure+well+being, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=how+does+gdp+measure+well+being PDF link annotation
    • http://zuduwamani.mypressonline.com/besokezolo.pdfIn PDF document text
    • http://benaletuzulug.sportsontheweb.net/cm_list_of_gujarat.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/nofividodugetamawa.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/characteristics_of_management_control_system.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/6ac18a8867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479925/normal_5fdefbfedf8d2.pdfIn PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/fasonilezijobosomobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_6035a27239461.pdfIn PDF document text
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/8102065.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/9700063460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_5fd1669a66250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369640/normal_5fde49f8098d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiperaw.rf.gd/charla_de_seguridad_vial_de_5_minutos.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/91252191298.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/21929593483.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/jalitifujapenojakomala.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/69611685260.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/75100239345.pdfIn PDF document text
    • http://deweleve.epizy.com/68015271172.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_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 5472 bytes
SHA-256: cc6bfb8ef8497247716ff5baadbabaca6ac063da328ee7d542e13d50229cfb83
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 11000 bytes
SHA-256: e6960017c05e8cef51dc86c84edd2b2b60e0951a2678ba1748e7ef2d5d8f2c54

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