Malicious PDF — malware analysis report

Static analysis result for SHA-256 78937941e0a220b2…

MALICIOUS

PDF

39.9 KB Created: 2020-10-07 20:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7de622151d9e38a0a81d1fb53647886c SHA-1: 63c2828bca0825927c73dd2e7ce80f91434ae9be SHA-256: 78937941e0a220b2194a0a585820e0de52efa10003ed97610eb80b90c8d07b8e
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=practical+skills+in+chemistry+3rd+edition+pdf In PDF document text
    • https://site-1043537.mozfiles.com/files/1043537/35628063315.pdfIn PDF document text
    • http://files.jaanemanart.com/uploads/1/3/1/0/131071252/vawobi-ganeporofi-pirazipaxaduvun.pdfIn PDF document text
    • http://najip.maxwelled.com/uploads/1/3/0/8/130814229/pararivimekatopaper.pdfIn PDF document text
    • http://files.buildingourfuturekc.org/uploads/1/3/1/4/131406781/4385699.pdfIn PDF document text
    • http://pobuw.silkpoetry.com/uploads/1/3/1/4/131453741/vuwikupu.pdfIn PDF document text
    • http://files.ladywellterrariumcompany.com/uploads/1/3/1/8/131856392/tujujilak-kimawevazuwava-ropuso.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/8e31f8d0-a338-4ea8-83d0-36850a25b335/kimisopafuzud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f37de3-2a38-49e4-acf6-be5a04713f51/89491222905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fe3953-7372-4af6-b51b-ad38d5f79e1d/kevogujitanokuwisaxiwaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fba5e32-a65e-427d-8850-b63668ca0f22/mituvav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b204e9a-804a-47ee-bfaf-ba077749d316/temuvawotopuzobabigitaba.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_off00005b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B72 5724 bytes
SHA-256: b6385e8bb50bfb28853b0e77a5b9cf92e9f62cc475fd253015d502c31179f10e
font_01_sfnt_off00006ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC8 10664 bytes
SHA-256: 14980f6324b1ef36665572997f4df3d2847c5d2adc9f7a6f44d97be0d1a1f890