Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cde5b2e9b03cecf…

MALICIOUS

PDF

33.6 KB Created: 2020-04-13 20:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8dfbf79e6ed04ddc401636398180cc91 SHA-1: 0ab52b55b90f9ecf8fcad79311552996573f8eb7 SHA-256: 0cde5b2e9b03cecf06bbb6ab6fd44cfdbc6f2b03a070e313c12e59c52bc47508
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://insureapplewatch.com/uploads/1/3/0/7/130740592/130740592.html#mr+bean+animated+videos++3gp
    • http://leggingsgalore.net/uploads/1/3/0/5/130551179/wekifukuzesiw_fefami_wuxizu.pdf
    • http://motmotcreative.com/uploads/1/3/1/1/131164157/bewuxifitojebiw.pdf
    • http://hlb-cc.com/uploads/1/3/1/1/131163590/2625138.pdf
    • http://fastfilings.net/uploads/1/3/0/9/130968973/5429305.pdf
    • http://businessoglivsglede.com/uploads/1/3/0/5/130589998/50f434652eb89fa.pdf
    • http://scruggsmetalworks.com/uploads/1/3/0/2/130287839/gizapotadaze.pdf
    • http://martipan.com/uploads/1/3/1/1/131164507/db8a55.pdf
    • http://prenatalyogatoronto.com/uploads/1/3/0/4/130478935/foguwidutebulu.pdf
    • http://mydiamondcleaningservonline.com/uploads/1/3/1/4/131437208/zemulejabotujexaxo.pdf
    • http://savethesweeneys.com/uploads/1/3/0/6/130620928/roluwupefu_jexagigobug.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c5c.bin
0c3633bed027e9896bf0e92ad54d1dd6d3c32df2cff01bf9c901de65a75ba4b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5C 7704 bytes

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