Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef87acea02f573d…

MALICIOUS

PDF

73.2 KB Created: 2021-02-13 21:37:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 0a49e89afdece2e28ef50f475ec7406f SHA-1: cb939d3117f5925970119217a364899bff97f1ec SHA-256: 8ef87acea02f573d332876996f35632612c01b61c9f64036d44a3a8e5268048c
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=supply+chain+systems+manager+salary In PDF document text
    • https://jorikumovitakus.weebly.com/uploads/1/3/4/8/134883246/9120436.pdfIn PDF document text
    • https://walamezer.weebly.com/uploads/1/3/0/7/130740591/6992653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fcdb5b232dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_60260977993e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448337/normal_5fe1210deaf59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_601ec6ff608f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5fdc4aebac2ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406216/normal_5ffff42a0852e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403946/normal_5fcfa7e8c1583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_5fdc0c08a0edf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481168/normal_5ff5bda39af6b.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/5650585.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/fejakixoweka/91807490996.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/coliformes_termotolerantes_en_alimentos.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/puwudaxomidujibaleturude.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/83908961752.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/35306226275.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/39020065546.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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 5552 bytes
SHA-256: c9e4dc5650f8d694f62635ca36c89c911a23cee7ec4be875bf42c0abb1ff9891
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10424 bytes
SHA-256: 47438c5da46bccbaa216e36531bd3e5bec19a939acf053edca74d89a4537e434