Malicious PDF — malware analysis report

Static analysis result for SHA-256 7887e608d504d830…

MALICIOUS

PDF

38.4 KB Created: 2020-04-06 06:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd23f2aa37e7dddfafb613b28305b334 SHA-1: 7b0239a16e63776cb3d44a0ee38d9d5195ec11db SHA-256: 7887e608d504d830ceebc46614b2b0404177c2a1150e77589c0556735b7e3cab
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to product names and URLs, indicating a lure to encourage clicks. The presence of numerous external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or malware distribution.

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://stevenjamesbarrett.com/uploads/1/3/0/8/130813490/130813490.html#pioneer+elite+7.2-channel+vsx-60+av+receiver
    • http://clearviewglassrepair.com/uploads/1/3/0/3/130313188/dukavije-tusep-nevonikad-mazorene.pdf
    • http://rosecityhealth.com/uploads/1/3/0/9/130969750/towavatividolid-bepitugut.pdf
    • http://mawrab.com/uploads/1/3/0/6/130621223/91a20743889e38a.pdf
    • http://samioahpahus.com/uploads/1/3/0/3/130313158/df44d2f2.pdf
    • http://thepunthaus.com/uploads/1/3/0/4/130488888/4aadb8571dfe199.pdf
    • http://ericaenglishphoto.com/uploads/1/3/0/2/130289793/gidutexurat.pdf
    • http://misfit-world.com/uploads/1/3/0/7/130740393/tunokixudejuzigalupu.pdf
    • http://adriantippetts.com/uploads/1/3/0/8/130814030/9286875.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_off00006a85.bin
25296906452f75303fb479992ba362e5d36b657de00ee7cb5a73eaea83005ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A85 9048 bytes

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