Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d7093ee5f07f6e…

MALICIOUS

PDF

66.2 KB Created: 2020-11-11 07:37:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 81a1b50bc734cf46dd1c614440353ed9 SHA-1: 1ea6113dd2eb9d190f9220645a17dd644953a840 SHA-256: 85d7093ee5f07f6e0a8c734cd8dc502b3fba2609d709f750e0ddd1dc3b890f97
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector and others forming a link farm. This suggests an attempt to lure users to malicious sites, potentially for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of numerous links points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 5

  • 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.
  • 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://traffmen.ru/strik?keyword=words+that+start+with+and+x In PDF document text
    • https://moxitason.weebly.com/uploads/1/3/4/3/134384587/e4d37bde756da88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f88881c56225.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/f2a63fb.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/788332e3-fc48-4851-acec-4843e240e043/12_channel_blogspot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fedf1b-a226-4ef6-b846-cb708b44bd47/92384281397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195d427a-8d0b-4300-8e6f-c8d53b267a2f/saxibulerelijubopoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b3cffc-823d-48ee-a826-f3594e83a267/xt808_flashlight_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294df9ca-f59f-4aef-a0b9-e5f8cd676ecf/bowax.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 1

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_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 5052 bytes
SHA-256: d2fc21f764d5233d148ae2c9200f145e6677b54c78bab80e0fe75053c133297e
font_01_sfnt_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 10880 bytes
SHA-256: e8a2e2e878ba567a2392957d43de8013216654833cb1d7711790e8b154376ade

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