Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fbb0c4b762906f…

MALICIOUS

PDF

37.4 KB Created: 2020-04-10 17:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 93dd494911fc04dfa45a12930c55a911 SHA-1: 2f0a3e5895d4a253d4c2491bcbb3c5b65315d863 SHA-256: 63fbb0c4b762906fbfce292a51749be8edcc23e2e5fdd2df297351f089586a9e
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 point to other PDF files hosted on various domains, suggesting a link farm designed to distribute malware or facilitate phishing. The document body text mentions 'Allwinner A23 firmware download', which is likely a lure to entice users to click on the malicious links. No scripts were extracted, but the heuristic firings indicate a deliberate attempt to create a network of linked documents for malicious purposes.

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://djkazonllc.com/uploads/1/3/0/7/130776810/130776810.html#allwinner+A23+firmware+t%C3%A9l%C3%A9chargemen
    • http://dichvu-nhantien-vietnam.online/uploads/1/3/1/4/131438642/3898154.pdf
    • http://yourrealtorabouttown.net/uploads/1/3/1/4/131482826/435ed594d98cbba.pdf
    • http://eraji.net/uploads/1/3/0/6/130640057/9749499.pdf
    • http://cryohousetn.com/uploads/1/3/0/4/130477702/6406758.pdf
    • http://superfotoshop.com/uploads/1/3/1/4/131483069/kejezidiva.pdf
    • http://allnationsinsuranceinc.com/uploads/1/3/0/2/130288492/penewisukire_bepifivakuxeri_mawalijigasi_bagokod.pdf
    • http://stagingserver5.com/uploads/1/3/0/4/130488412/449bd19fdb.pdf
    • http://anewdo.com/uploads/1/3/0/9/130969420/e09868335781.pdf
    • http://dodgeplanroomqa.com/uploads/1/3/0/7/130776449/paguvefufojedisis.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_off00006810.bin
c3b7e9d30721ef96b0e06a168ff7aaa32dff614f757efbeffc8f4de48b6144a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6810 7904 bytes

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