Malicious PDF — malware analysis report

Static analysis result for SHA-256 495e9ef10e5dcbb6…

MALICIOUS

PDF

75.5 KB Created: 2020-12-31 16:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3f207950b85b2fa3106cd434f80bcc5c SHA-1: 9ec4939b6a485e6d5d200001a90d956f421087c5 SHA-256: 495e9ef10e5dcbb6d4b02d593b97f0f85969709896685a3a4e06adb489efc743
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, suggesting a phishing or scam campaign. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, contains metadata related to 'Santa claus video call apk', potentially a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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?utm_term=santa+claus+video+call+apk In PDF document text
    • https://labiduto.weebly.com/uploads/1/3/4/5/134584073/fadox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fc3bdabe679a.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/2741884.pdfIn PDF document text
    • https://fenotitejov.weebly.com/uploads/1/3/5/3/135316040/tabalo.pdfIn PDF document text
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/2879340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fcd3e0cb3fd1.pdfIn PDF document text
    • https://wegedojilo.weebly.com/uploads/1/3/1/3/131398291/328208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5fbc72a34894b.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/fce0589d-6971-4711-b8bc-e1e4b7641428/98454480804.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC467 5200 bytes
SHA-256: ef7a9b0784fbda945b54a5de334fd3d24919682b7e9f63bcb3afa6915ad5f1c9
font_01_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 4000 bytes
SHA-256: 0784c2d2dcb9a07465f83cc261365bde5a06a48ef28f3679c2a2c1d167e879a8
font_02_sfnt_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 10876 bytes
SHA-256: 8e597a0f124bb2bd96d7af27ff4de8a3288853227ea430899d78220ac5cdfd9a
font_03_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 16952 bytes
SHA-256: 4a310c86b5d1b794856bf0e7ddaf57fb9555fa423afb59bbf9687794588b0d81

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