Malicious PDF — malware analysis report

Static analysis result for SHA-256 277eeba28575b391…

MALICIOUS

PDF

77.6 KB Created: 2020-11-23 07:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4d9364906f77f1b1c2c8b87b417341ba SHA-1: b2d4717106154c8fd9250e06a7a35c034fe995fb SHA-256: 277eeba28575b39190f3b5438733f230879bec8ec85f6ba8e80bc911054d3a59
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with a critical ClamAV detection for Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'resuscitation guidelines anaphylaxis algorithm'. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload or lead to a phishing page.

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://ggtraff.ru/aws?utm_term=resuscitation+guidelines+anaphylaxis+algorithm In PDF document text
    • https://mubuvume.weebly.com/uploads/1/3/4/8/134885019/3328906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f89f07e85755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_5fb2861ec7335.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/9df985fc-3705-45af-86d9-e8ffb385a304/ahri_guide_s9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590dbbcd-97f7-4d49-8d02-8060ad02e92d/valkyria_chronicles_4_chapter_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ced870-f8aa-49a2-aa23-47bdf90dd862/87429651619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7debfd-aea0-4e0c-9e0c-85b55c46402b/33207806139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0697a9-d9c3-4ff4-a1b3-551515e8da7c/33355763516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fd98fc-64a5-48a6-accf-d7dbf9b6de8d/365_names_of_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ca6438-1c9e-42fe-8e22-77467a5ab429/13699928919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d826ef-9b7b-4c9a-a266-fa21b33de40b/proform_tour_de_france_2.0_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e6e498-aa21-4e93-a318-bc775f389804/punulaxeponisovas.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_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 5664 bytes
SHA-256: 83acf0adf121b83eda71b759bd92605faea9e1f24ca9bd9085ac992f8b51151a
font_01_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 11040 bytes
SHA-256: ea761847f4529165154142106c95be8e7561d12d725b69ab540ff7a5376b903d

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