Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb853e23e1da2984…

MALICIOUS

PDF

67.7 KB Created: 2020-11-19 00:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e98f0619e1a20ee8d545616249073ad0 SHA-1: 77ecd8feb13b30bebe2908d0129634f6332beaa4 SHA-256: cb853e23e1da29840b0d4b19812fde94c61ddb1a7fe5e6b9879ea1197b701611
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate that the PDF is designed to link to malicious infrastructure and potentially engage in SEO-based phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://cctraff.ru/123?utm_term=lake+erie+water+snakes+on+boat In PDF document text
    • https://lodinewonob.weebly.com/uploads/1/3/4/4/134475472/f1e97f60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_5f9c6aa8e8b68.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/tosevud/uniform_cost_search_in_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130b5e06-0996-4ff7-9f09-4786611f3e29/kewufokutuxazujovorimis.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/bdo_archer_guide_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c167366-bd93-4b5e-bc6b-615ab5411b17/46172530951.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/mossberg_mvp_patrol_stock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea020fa5-580f-4a41-a7be-f9ee3ac7c922/reloninisevusunaboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6deb7413-5d7b-4aaf-80f1-a17d65e92031/82150239626.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/9466236009.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/avg_protection_for_xperia_pro_apk.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_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 4884 bytes
SHA-256: d4b26bb80e203bf2eff657ab80844fabb99678afe14cc07e6ed3eda669fba720
font_01_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 10744 bytes
SHA-256: abd9d2302762038d10ab55f83f810000769b73e294565f709dbf90a25cf9d899

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