Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb27634be3063b99…

MALICIOUS

PDF

82.3 KB Created: 2021-03-09 10:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0ddc387771f1cff04a0929c8917dabb4 SHA-1: 2515ac3d9a59ccb5b1a8164a78ab202c259b064d SHA-256: cb27634be3063b99c59d43c08bf75c358137367f9ee1f7fc18dff0fd5bdc703f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous external links, including a link farm and an SEO redirector pointing to 'https://lozipotod.ru/wix?keyword=internet+censorship+debate+pros+and+cons', likely intended to lead users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristics strongly suggest a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=internet+censorship+debate+pros+and+cons PDF link annotation
    • http://trokot-roznica.xyz/29534531482c9od8.pdfIn PDF document text
    • http://wesaremujoworu.22web.org/gotranscript_audio_test_answers_december_2018.pdfIn PDF document text
    • http://alex-chekalev.com/manual_de_calidad_ejemplolhnn6.pdfIn PDF document text
    • http://komejab.iblogger.org/greater_london_bus_map.pdfIn PDF document text
    • http://dolijajoz.22web.org/v_a_t_ka_full_form.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/ninazarila/gimedixupavazatigeniv.pdfIn PDF document text
    • http://gurumuniz.rf.gd/4683671373.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_16a626108c544fda888148f15f7fa0d4.pdf?index=trueIn PDF document text
    • http://bexituxupogetav.rf.gd/11737318284.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_9955870d2bc04cb9b724bf614c973868.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/90170461869.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/folitipelow.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_ad87f468affc48a2af9cf44f4b4ad54d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizedumi/xugotedebomojemanu.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/basking_shark_facts_and_information.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/alteryx_server_2019._1.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c37c82671eac4e47ac043e52425a2ff8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/88609193031.pdfIn PDF document text
    • http://tuxugev.epizy.com/unblock_website_vpn_browser_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/42120947432.pdfIn PDF document text
    • http://panulanupujudun.epizy.com/emulator_mac_for_windows.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_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 5208 bytes
SHA-256: 326d5597e77801f1af9879dbeac9bd85bb8e4e0054f94547ce1743a0da05fa99
font_01_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 10008 bytes
SHA-256: 2d00024ad875ace57b3c76bdb5199cb6dd206b00351f3f5aa9367ac89e19f718

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