Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81998c65edce87c…

MALICIOUS

PDF

80.1 KB Created: 2020-12-17 00:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9378b175d76696bcbd15c22658392f23 SHA-1: 7241f91cb24ad6902e11456ae880535fbfd46217 SHA-256: e81998c65edce87c1b518d4e873ed3645de3e8b08752dd699180b30cb313087d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and one specific URL that appears to be a lure related to sheet music. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute payloads or redirect users.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?utm_term=that%2527+s+amore+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5fd69d921bb42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f95dcfd58cc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8715ad0f29b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5fc5bc3e14cf3.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/b16cf244.pdfIn PDF document text
    • https://vakesefujes.weebly.com/uploads/1/3/0/7/130739027/2062615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5f995c67a2d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f87de6b848be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f9db14ef2efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_5fbdc69e6db1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5fa49458be6f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379217/normal_5fc46dfb91bba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5fcc5e7e95544.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/forerumanu.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_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 4988 bytes
SHA-256: 2a556a6a8031fe294bb6cc73b1e95e2aa7ddc796c074be2c4f74338b1cb824d2
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 10656 bytes
SHA-256: ab7732984b07d62a29ef7cfc7efe71d11db88025980356fea719661a8bd73cfd
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16100 bytes
SHA-256: b59afbb2f683942213df284fd86cd9422ada0c5f1ffac7698db8c94a40390bc4

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