Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d37860365aa9c7…

MALICIOUS

PDF

69.0 KB Created: 2020-11-25 11:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db589e6895e2d0b9d3bc3de7d5354dda SHA-1: 19a32b10acfa3ebdb55b8b9c0748f07a50a648f3 SHA-256: e8d37860365aa9c78f2fd6e8034f79ecd059af7eb5e33e6d44d7f5cce5230122
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of a link farm suggests an attempt to direct users to malicious or deceptive content, potentially for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=first+act+guitar+electric
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8a1753761ff.pdf
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5faf9680421ad.pdf
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fb9cce8533ae.pdf
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/cb76b70c01.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fb3f1693b223.pdf
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5f90a06e9f20d.pdf
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f88b11365d24.pdf
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5fb9c55317b66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3e52bd28-7ade-48e2-976f-ca4f444c31d2/snl_fidget_spinner.pdf
    • https://uploads.strikinglycdn.com/files/d18105a4-523d-4f1f-bdc0-4012845a9c0e/6722502870.pdf
    • https://uploads.strikinglycdn.com/files/30693bc8-6eab-4d0d-903b-6355be7176f0/54003802570.pdf
    • https://uploads.strikinglycdn.com/files/e150222e-7da8-4a54-a60c-e16326f78ea4/gukulivopuwazejosumudil.pdf
    • https://uploads.strikinglycdn.com/files/a1c29d40-9a81-430c-aabb-81878bcaa0e6/bawekaxaroduwuba.pdf
    • https://uploads.strikinglycdn.com/files/d026f1e0-b180-462c-944a-9fe75bf2054f/77574370379.pdf
    • https://uploads.strikinglycdn.com/files/65b196f5-5105-4028-b576-6e590202076a/fosonutuwupide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d296.bin
f98bf823ecf15228b0cdd9f9efe7e41997daeae31a88cd7e09b7133aaa2af27d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 4924 bytes
font_01_sfnt_off0000e367.bin
bebc95afb91d95e808d9e811c1bb01e642d15b8293e963fe6bf16b8387db19ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 10632 bytes

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