Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d2a61d73c5dc57…

MALICIOUS

PDF

78.7 KB Created: 2021-01-01 04:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcaacdafe55be98f3b5d30ea6da3bac3 SHA-1: 70de5317959879580948b2cdd232d128f0ee02f6 SHA-256: 19d2a61d73c5dc5756be537c71bd6532e0a45b18960856d4e0c3c34583cff370
154 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains an embedded URL that points to known malicious redirector infrastructure, likely intended to phish for user credentials or distribute further malware. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?utm_term=diamonds+monsters+runner+game+2d+platformers
    • https://cdn.sqhk.co/nefowumik/X0RwmQ4/52565075736.pdf
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/minizomipez.pdf
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fd3965f57d84.pdf
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc8e14f313ee.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tugunari_fogeze_nezejavoz.pdf
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5f8b4d1fce81c.pdf
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/aeb1d707b.pdf
    • https://static.s123-cdn-static.com/uploads/4388416/normal_5fde5c8614dbc.pdf
    • https://cdn.sqhk.co/leperanurosi/f5ibzih/lepununim.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/padiwagunajomes.pdf
    • https://cdn.sqhk.co/mezutorixo/Vlc6VeO/thanksgiving_2019_deals.pdf
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fa958057bbcc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f815.bin
2c467df55ae9018660b8334383ade0e26cc8ef2db420768a24dad44579e21759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 5492 bytes
font_01_sfnt_off00010ab1.bin
4e5a8e6876510ac69edc351d9acbabcf8a7454d097ebc0fa15b0ea83df485b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 10208 bytes

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