Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a497d5b45de1a8…

MALICIOUS

PDF

41.5 KB Created: 2020-04-12 10:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 501ecb5dc8a04b4c4e519a9c0a8d0050 SHA-1: 272431c7c78c75cdcbb38ee64c378544e643905d SHA-256: 09a497d5b45de1a8c7778ffa618fe67823b26412bf1de8494e904671617777aa
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to host malicious content. The document body, though heavily obfuscated, contains a URL that mimics a search result for a dictionary app, suggesting a social engineering lure. The presence of many external links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful sites.

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://purerockcolours.eu/uploads/1/3/0/7/130775676/130775676.html#best+arabic+english+dictionary+app+for+android
    • http://asraifae.com/uploads/1/3/1/4/131407406/38cf4b8b4ca2.pdf
    • http://tylerdecorhaven.com/uploads/1/3/0/3/130313107/vademarofogado.pdf
    • http://semfinproduction.com/uploads/1/3/0/2/130270747/waruvot.pdf
    • http://alovethatlasts.net/uploads/1/3/0/7/130776272/punodipokuni_gewuxexoxeme_guxobubik_tojetanefa.pdf
    • http://familypopcorn5.com/uploads/1/3/0/9/130969137/6b5f6768.pdf
    • http://pekkakallinen.com/uploads/1/3/0/6/130605083/pusesodebawi-bojovijem-zaguxowe.pdf
    • http://wonehson.com/uploads/1/3/0/5/130588482/kiganiwiluluvup_rikopo_pupaj.pdf
    • http://searenas.com/uploads/1/3/0/6/130639327/6819643.pdf
    • http://secondlookdds.com/uploads/1/3/0/6/130639681/33af55e45.pdf
    • http://thespiritofgettysburg.com/uploads/1/3/1/0/131069762/tojotugodiziga.pdf
    • http://dioceseofpolynesia.org/uploads/1/3/1/4/131408241/2684904.pdf
    • http://ibodyacademy.com/uploads/1/3/0/5/130539370/valiveme-piwiwasapixuba.pdf
    • http://visitnewberryfl.com/uploads/1/3/0/6/130604342/podinefovemujibox.pdf
    • http://infinitefilmproduction.com/uploads/1/3/0/5/130545957/6489735.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_off00007b47.bin
57d9c45f36284f63bb549763174d40224ed5378d96fdc3699a038f3875248ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B47 7912 bytes

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