Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac543090f7d01b1…

MALICIOUS

PDF

42.5 KB Created: 2020-04-06 13:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2084e127ca6908c143f2b9b0c04ae572 SHA-1: 31972f32e487808bb8c3fff1ce4e7cfda09ae8e9 SHA-256: 4ac543090f7d01b147bd19bb079d01fcaae69861495fa4ecb5533b805f0288c8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, many of which appear to be part of an SEO link farm. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior. The document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list. The primary purpose appears to be directing users to a network of sites, likely for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://praxisiso.com/uploads/1/3/1/4/131406932/131406932.html#semillas+de+cebolla+negra
    • http://mydaisyschain.com/uploads/1/3/1/0/131069764/6f510800aad61.pdf
    • http://crystalaurajewellery.com/uploads/1/3/0/7/130739146/tevegusulap_posar_vawibuko_peximitajixuled.pdf
    • http://myentelechy.com/uploads/1/3/0/8/130874119/2403679.pdf
    • http://cpr-trainingclasses.net/uploads/1/3/0/2/130287500/5677032.pdf
    • http://jennierindler.com/uploads/1/3/0/7/130739852/2324238.pdf
    • http://dashhealth.com/uploads/1/3/0/6/130605443/a73c266a93.pdf
    • http://hartmanenergy.com/uploads/1/3/0/7/130738708/sakow.pdf
    • http://donaghmedemusic.com/uploads/1/3/0/6/130639801/5082500.pdf
    • http://cookiesbycatherine.com/uploads/1/3/1/3/131398430/wujuvazokikor.pdf
    • http://shadowmpc.com/uploads/1/3/1/4/131438448/wawixobekiwibawipem.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068bc.bin
a82882f62113ebf8a20d9efe2a95988985ae39f88257448f262a8d789b8f1820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BC 8204 bytes
font_01_sfnt_off000086f5.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F5 16036 bytes

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