Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83c43c72a3b27fa…

MALICIOUS

PDF

43.2 KB Created: 2020-10-04 02:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1011ee0be39b7aeaceb19d67a53486be SHA-1: 81437515188a89a0213fb1b518c4946462eb48d2 SHA-256: f83c43c72a3b27faf3ba2ebf7b14874e3fe4b98dbb19b39c71ebf4d65351fd03
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?keyword=super+refractory+status+epilepticus+pdf In PDF document text
    • http://files.jcjnutrition.com/uploads/1/3/0/7/130740464/23531.pdfIn PDF document text
    • http://files.renfrewshirepsychology.co.uk/uploads/1/3/0/9/130969474/zonanineradapud-tofofa-xijetatosana-beridejep.pdfIn PDF document text
    • http://veferiza.amberleafpublishing.com/uploads/1/3/2/6/132695361/4531006.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/b563c77d-25f1-4368-9c41-a905287bb72f/75885674520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea791601-243f-4e97-98f7-7f10aa166f5d/jetusogukepubesiperiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393a173a-8881-482b-a8d7-6ad8395f527a/zazesejirelunofefati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8042ab28-52d0-41b3-ba28-efb6c8fc4409/nikurobofejaserakazuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81bca513-ca5d-47fb-acfc-4e5eb4fda9a5/69851227243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d217ec-5f23-40f3-96a0-9ee5fea48296/xemebik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00489f1-761a-427f-9aa8-115a6bd28a8f/wamidonor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7af690-b8bb-4a51-84d6-eebea4c32a2b/rodurobuvenok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2ccaf1-9ef4-492d-abd3-6d6eb6ea267d/nuwabekafawisadopafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c717ad80-9e2c-42b3-b540-72bf4dbf7fdd/85021036391.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 5

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_off00006b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B84 5352 bytes
SHA-256: d25c1d6eda6fd813e43b4c31044362f84a4955197689990123e11d1e04e8a3a5
font_01_sfnt_off00007dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCF 10172 bytes
SHA-256: 82416327abe8ce295c586a363f6accc35ca89469a6a36d04bf948ca529a5379b

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