Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9955bcbcc62c419…

MALICIOUS

PDF

43.9 KB Created: 2020-10-01 15:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 539e400b541b7b2d3810a2a43f85feb9 SHA-1: d56e111135470d05b641cb98e60bf1e0f5c98622 SHA-256: f9955bcbcc62c4193e23e36dd7e51856bbe7884628445d07ce2dd75b43924a17
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://cctraff.ru/strik?keyword=teaching+assistant+job+description+pdf In PDF document text
    • http://kixuneje.calgarybmx.com/uploads/1/3/0/8/130874493/391e61c7f5.pdfIn PDF document text
    • http://mopoke.cambridgenyupc.org/uploads/1/3/2/6/132681026/8bb914.pdfIn PDF document text
    • http://files.benglen.org/uploads/1/3/2/8/132816160/1974331.pdfIn PDF document text
    • http://mudagiv.christianpensel.com/uploads/1/3/0/8/130813747/3268631.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/5dbac5b5-0177-4289-967b-c7450a996101/66065112650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14769075-d58b-4b4a-8a76-f28a5325f115/40857309485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b74252-df66-46e1-a327-766b4d0b33dc/14755705498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e673d4-89d5-4fbf-a6d8-15385c678b1e/sizujipawudagipobipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206295a9-db35-43cf-9d8e-74ee422002ae/voxorumadelafede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bd0cb3-4645-4e77-a135-782b3302c7cc/zadopawuril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7629d112-6059-4366-afd9-59b7aeba88b4/nojopof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b9b010-e495-4a7d-a156-d80288f9f0f9/93769902574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964e15cd-b8c0-466c-a9ae-57720e448317/garonawidorobivur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca12f8b-5dbd-4723-b4b6-d41f4ebb0c0e/74277517522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5d3c42-e5f4-485f-9beb-9f082199366c/23739225642.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_off00006cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFF 5548 bytes
SHA-256: 92417339c1b66e768717e12d8370be8a97fdc3ee534061194da29e227a2ce7be
font_01_sfnt_off00007fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD2 10112 bytes
SHA-256: d1be085e145584cb42494fde3d9018bff8ed8a82581bd67b401a7f4e35bcc90b

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