Malicious PDF — malware analysis report

Static analysis result for SHA-256 4729a8869ceaa10c…

MALICIOUS

PDF

76.6 KB Created: 2021-02-19 02:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 80860f2af11f5695f940e93cd98dbf06 SHA-1: 023016e019ac4c5dbd55f6ac5c3ae4bb41e864f8 SHA-256: 4729a8869ceaa10c3a881a97b6a44746958f858095f418e3e186dbde0e1e6eac
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/aws?utm_term=candidate+elimination+algorithm+generates+mcq In PDF document text
    • https://cdn.sqhk.co/zoxowowi/hgegcC0/25878634844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_5fdb732c99782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_600be4201ea28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_602c57a6e35ff.pdfIn PDF document text
    • https://jakazopafekitab.weebly.com/uploads/1/3/4/6/134632018/juramuj_somidixo_zimowiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_5fd8354076405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5ffd28847f58a.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/piegiWE/9396300244.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/jgiVVlO/tidibogimubefozivukes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_6012c112177c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_60131b7c339af.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/mosezavor/bluebeard_perrault.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/keropusalagudeguxupip.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/loturilupaku.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/32805921752.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_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 5384 bytes
SHA-256: 636a0cae9370d4888e14a2e5d92c135e94cfdc2eeae950e4dcc6f45ecc8ac6e4
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 11728 bytes
SHA-256: 18241c43c7297db8836d79c1443905938e719b55d32edcd961fa6291a06377f7

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