Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79cc504b9bfebf2…

MALICIOUS

PDF

68.5 KB Created: 2020-11-24 22:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fa8cc470fabc1c05ea6846fbf9f95279 SHA-1: 1ea93244bf6bd8b2ca3a90a88d8d42cb180feac3 SHA-256: c79cc504b9bfebf2281f936d010aa6347d97725a557014342ce2ad6b54b08a5f
214 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 URLs, with one identified as a malicious redirector. The heuristic firings indicate it's part of a link farm and is flagged by ML classifiers and ClamAV as malicious phishing content. The primary attack pattern involves luring users to malicious sites via embedded links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=hexblade+warlock+5e+pdf In PDF document text
    • https://ponokexagetax.weebly.com/uploads/1/3/4/3/134326843/jofubinusotubilunura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5f900661f3297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f8b098303384.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/1441719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fbbe04e5f7dc.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/54d14357-6e56-427c-bc01-e0200a0e49eb/sewaraxilupokixazebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958b5ee5-3827-4699-bd0a-b8fc3b81efce/Kpea_odahov_ventiltor_a_ohriev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aea8427-05c8-4137-8fd8-fb6950b5b70e/1651480464.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/slideshow_bootstrap_4_template.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/51648181787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25dbc85-b326-45c2-9a5b-20d5f24db077/43831835118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba7b495-beac-4d05-ad3f-1d6e7a52a350/valobowinivizetoratubazez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085db0a1-161c-4d08-a40d-093c2e58fd17/brightest_light_bulb.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_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 5420 bytes
SHA-256: 4e294e4419236663fa27841799ebbb648f6943ef870d50cd0fff0b543f5922f2
font_01_sfnt_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 10332 bytes
SHA-256: 6607ee05e8f37e083dcffa671a5ef93bf8fc9f1ae36224449f01cbab46135e44

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