Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcf4fcb9a9fa9c5…

MALICIOUS

PDF

34.2 KB Created: 2020-05-27 13:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6c7709a119cc60303081fe9765fec51 SHA-1: 9a18219e243e20ce4c79ecfea36a17fcd5704453 SHA-256: 4fcf4fcb9a9fa9c503dfc2503f93da0961c4c6f567aabef0aba4da580acee5f5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains. The document body, though heavily obfuscated, contains references to 'ios 9.3.5 ipad 2 setup.app patch', suggesting a lure to trick users into downloading or visiting a compromised site. The ML classifier strongly indicated maliciousness, supporting the interpretation of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bouvierarchive.org/uploads/1/3/0/4/130435644/130435644.html#ios+9.3.5+ipad+2+setup.app+patch
    • http://conoreager.com/uploads/1/3/1/0/131070329/liguxavavejulirep.pdf
    • http://webdisk.wemooveit.com/uploads/1/3/0/5/130588639/dutovutex.pdf
    • http://arteducatorsofiowa.org/uploads/1/3/0/3/130323293/acd3c23c40.pdf
    • http://bonusmath.com/uploads/1/3/1/8/131856330/330770.pdf
    • http://mail.allagentfinder.com.au/uploads/1/3/1/4/131438397/ruluturefaraxepafar.pdf
    • http://mail.maquinasplatilleras.cl/uploads/1/3/0/6/130603986/jowilazivavo_povawotuxagimo_wazotig.pdf
    • http://isla.ogarajetsproposal.com/uploads/1/3/1/3/131382126/nalako_mudobito_juladux.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_off00005ab1.bin
79a68276de7571c445c79433eeb5668e637f4848bd5aa4d16dabb3ac1a54c7eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB1 10436 bytes

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