Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93d39b326488775…

MALICIOUS

PDF

69.6 KB Created: 2020-11-24 22:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13217e6171dfb56c88ed1b82155b4632 SHA-1: 13e1f5290a02e0c2fb8dfb78d10656f66b766fb8 SHA-256: b93d39b326488775b5da99256f5fe97f5756e0dfa1b726bf9895ae72d3a550ef
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The presence of a link farm and a high ML classifier score further indicate malicious intent. The document body is heavily obfuscated, but the heuristics strongly suggest a phishing or malware distribution lure.

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/strik?utm_term=nashua+high+school+south+graduation+2020
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5fa634c8a3ced.pdf
    • https://feleluxotikuko.weebly.com/uploads/1/3/4/3/134338959/154f14d98.pdf
    • https://cdn-cms.f-static.net/uploads/4448346/normal_5f9df5c20c64c.pdf
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/fewuw.pdf
    • https://morowuze.weebly.com/uploads/1/3/4/5/134580979/belogafes.pdf
    • https://cdn-cms.f-static.net/uploads/4417814/normal_5f9d579a4c905.pdf
    • https://bowukobi.weebly.com/uploads/1/3/4/7/134706413/1851051.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/23f33efc-cf09-401f-ba7e-08174f012a36/introduction_to_public_health_5th_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/97ac576c-8c34-4481-ab7e-4db36e7e464c/wakajekuvujepife.pdf
    • https://uploads.strikinglycdn.com/files/c41ddebe-14f2-46bb-a6aa-954c28c3b1c8/lekiposavekodesonomik.pdf
    • https://uploads.strikinglycdn.com/files/237c5011-7f95-4a22-a18f-a5eae64cc8e9/talutabujodana.pdf
    • https://uploads.strikinglycdn.com/files/cb74a2e6-d181-4fa8-8a2f-ea4d94c4d992/69436509678.pdf
    • https://uploads.strikinglycdn.com/files/c140f781-468c-441f-89cc-28d29b04420b/gikabemifif.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_off0000d4b2.bin
eed29b8f59b0bce7df183495a02781c0eb80e7620ddb64d630d68d621ed77ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 5444 bytes
font_01_sfnt_off0000e730.bin
a12e6bf0ac2453e7c941da279ed4a3a54b75b6f8ef1843dd76a97f22019ebe36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 10032 bytes

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