Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1ea581118a8e28…

MALICIOUS

PDF

86.7 KB Created: 2021-04-29 11:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c08e1a3e4d61cb511256e17d6b86572e SHA-1: c4a6652885a80dcbf34019070e6974e76bc50d30 SHA-256: 9a1ea581118a8e28b59802a009b0c813a939dae6ac17a093ee4bd1162412f622
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links to external PDFs, many of which point to a redirector URL. The primary redirector URL, 'https://yafferge.ru/strik?utm_term=pokemon+sword+and+shield+reddit+trade+codes', is flagged as malicious and likely serves as a lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=pokemon+sword+and+shield+reddit+trade+codes In PDF document text
    • https://gixopujo.weebly.com/uploads/1/3/0/7/130775076/7348691.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/arthritis_back_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/icLHVhj/learn_and_master_guitar_chord_charts.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/character_traits_passage.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/jbgejaF/27578414891.pdfIn PDF document text
    • https://pubasozivo.weebly.com/uploads/1/3/0/8/130813448/motakajuron_vuxugoxonoserat_woxukap.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/CsnheRk/hill_climb_racing_2_apk_download_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ab09ea-435c-4ae2-a922-eee5df53edce/lesefuzivegusuponufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9e3680-4aef-4ece-837b-6a632762a422/pakibumazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04bda857-830c-4cc0-8177-bb2f0c8ae06c/39577533495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5011a3a4-8f30-48f7-afb5-b22134e6a1da/gevalia_coffee_maker_filter_basket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052370a3-ed12-4684-8cc5-0e17a0fc7eb3/3112771044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ada32a-5243-4ca3-a65e-6b323f101e00/genavazigerejuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9f5df2-7fb1-4fe9-a6f5-dc04ce4fc58b/sipelabutuvefolizedudev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f6fd60-7676-4616-9329-39b5f0bdd6e8/74325846769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb9ea6c-f30d-46ea-80c5-0a18d40c390a/como_pasar_mililitros_a_gramos.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_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 5336 bytes
SHA-256: c3972dd79505ad7062f6d343b4196f8c533dc3237773ec52c13df5c872091c21
font_01_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 11280 bytes
SHA-256: f283360972972c457c202301dc45d2a121e4757fa5c3634d33e5945bc4663eed

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