Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c2b60a196486f2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 16:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 84d42745cca37785c0be3b0188a53e31 SHA-1: 6580b8d24258a06b97f06a3b7c060a2317ec8969 SHA-256: a0c2b60a196486f211fbc39e410a98446de3bc431c02212cf5411fcd68b139f2
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as a potential link farm and flagged by ML and ClamAV as malicious. The document body, though heavily obfuscated, contains keywords related to 'cdc' and 'chlamydia', suggesting a phishing lure. The presence of external URIs and the overall detection by multiple security tools indicate a malicious intent, likely to redirect users to a compromised site.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/award?keyword=cdc+chlamydia+pdf PDF link annotation
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/giluninatotexufin.pdfIn PDF document text
    • https://fivefijoxiwu.weebly.com/uploads/1/3/1/4/131453543/potip-pufof-dedikor.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/dujum-vifosekati-rewuwilixuxo-gijoravibupajuk.pdfIn PDF document text
    • http://lafefutom.iblogger.org/24422157399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5ff0057153.pdfIn PDF document text
    • https://vudulami.weebly.com/uploads/1/3/5/9/135964857/kawegi_vivonikobuvisaz_fajefizeza.pdfIn PDF document text
    • http://kerefasiputupez.iblogger.org/my_maytag_fridge_is_not_cooling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_6044fa3d72ed1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5ffcfb156ecb5.pdfIn PDF document text
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/121eb0efb281.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/ritoma/71751509141.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_24be57e02f5d40dfa6929d3ee4e2f552.pdf?index=trueIn PDF document text
    • http://seluzapiz.rf.gd/18682845382.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/breaking_night_audiobook_free.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_eb47c3b43230409e8eb08f85deb8227b.pdf?index=trueIn PDF document text
    • http://jojisoxig.epizy.com/2875039084.pdfIn PDF document text
    • http://gifefuko.rf.gd/9036824880.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 5128 bytes
SHA-256: c58975ada7e79854c00c8ae8cb0b3fef6127b4d0a5fb7766b6da96208dc343aa
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10668 bytes
SHA-256: 527478402a8fbda0d9dfda48affb03c10cb30fdf1a1803d8e951d9b8a9b4551a

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