Malicious PDF — malware analysis report

Static analysis result for SHA-256 545fb972f341bb8d…

MALICIOUS

PDF

118.7 KB Created: 2020-12-19 15:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5a789feab560c5d80c79f81e129ecc40 SHA-1: 520380b5df7d17cdf22c223abb05ff59b8449b30 SHA-256: 545fb972f341bb8d86c4ce2df3207fd6a49c438d150be42dbadd39d2d093083c
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 numerous links to external websites, many of which are identified as part of a link farm or redirect to malicious infrastructure. The presence of the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and the ML classifier output strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to popular media, likely to trick users into clicking the malicious links.

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://gettraff.ru/aws?utm_term=courage+the+cowardly+dog+episode+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5fbe80733362a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_5fc3630ee8a24.pdfIn PDF document text
    • https://xomugiwonin.weebly.com/uploads/1/3/4/2/134266294/valukine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5fdccd3e7cbc7.pdfIn PDF document text
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/05e8207d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5fae629c96cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f95b0fae4f40.pdfIn PDF document text
    • https://wulukisogexoz.weebly.com/uploads/1/3/1/4/131438059/7404649.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/08c48253-5d4b-45f3-8fb0-42519e24ccda/gejesemuwijed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58a3771-7355-4a3f-91fa-0433eef56d5e/mofixinudimutifaje.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/44800393102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8e3da0-0fd4-4f54-9d9c-0a2de6d1ba01/nirifes.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00019d1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19D1D 27588 bytes
SHA-256: f18f98b8741fad465f7a1c7fdf5a9c37e924173b6d26550c48b5fceeb5bbd851
font_00_sfnt_off00016488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16488 5484 bytes
SHA-256: f958f9868d15d1b537e9ea2adb0071858388ab5ed7c06d23f800abd2dcef03c1
font_01_sfnt_off00017744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17744 11036 bytes
SHA-256: a480b5d5080975a9f5a0c53d2603a6091779df86f6b70976d096b55eeb8d07d4

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