Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b4e2b631b9820a…

MALICIOUS

PDF

91.8 KB Created: 2020-11-13 03:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2bf85296155671fd897042068fe2ebad SHA-1: 20131faaba71d28675d7706cc980030a7ec0db27 SHA-256: 55b4e2b631b9820a4cc59f5b07b224b9726bb6c5502bfbc35f34c5d4260ee03f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=best+manual+garden+tiller In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f95d14d2cd03.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/punadax-kazugokov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5f94bb75ac62c.pdfIn PDF document text
    • https://xezevatev.weebly.com/uploads/1/3/4/7/134730214/rutul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fa41be51d7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f870cbcce1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_5fa289f76422a.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/9aa7af59-fbcc-474d-a8db-cf2867338955/5148976921.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/14742542043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6320224d-ca6c-4982-bd5f-d9945afeb253/14687281973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5704bfda-e109-44ed-a1f6-4ab128efa604/9766664613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0658fcc-1f1e-4618-bec4-96d77e38e739/40809703065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5e4d4b-1f9a-499a-81a6-5d0fa9582fbb/34664447577.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 5192 bytes
SHA-256: d83011ff5cc11f7530318016824b08a51377976aa7d8c20b156af8f2dafaba6c
font_01_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 10564 bytes
SHA-256: fc81239dd4ac79f3e96deed71d97a0b3c19b02d98fa6b5f6c242dbe9797b2558
font_02_sfnt_off00014d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

Open this report in the interactive analyzer, or submit your own file for analysis.