PDF malware analysis — malicious · 895108dcf9fcca76

MALICIOUS

PDF

34.8 KB Created: 2020-06-01 14:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dce761744ba71aff3c7a59de97023903 SHA-1: 8e5c972aecb3948916c71b70f42bb6fb4f9a6eb2 SHA-256: 895108dcf9fcca76be7e6586f00c3157f7987177125fe9ea07ff8eb1b9a73937

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links disguised as free downloads, a common tactic for distributing malware. The ML classifier strongly indicated maliciousness, and the presence of a "download button" heuristic further supports this. The document body, though partially corrupted, contains URLs that are likely part of a link farm designed to host malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://webmail.t2troubleshooting.com/uploads/1/3/2/3/132302928/132302928.html#the+vampire+diaries+books+free+download
- http://theyogaedit.com/uploads/1/3/1/4/131437676/e29b18abf26cbe.pdf
- http://operationcleanoutia.com/uploads/1/3/0/6/130604911/zesamibenajuwud.pdf
- http://hamburcorp.com/uploads/1/3/0/9/130970014/79c26b.pdf
- http://amandlastenberg.com/uploads/1/3/0/8/130813427/8d34a916a0dc1ee.pdf
- http://mail.lmican.com/uploads/1/3/0/3/130313132/zarakagunoxi_dazamenibudive_runuworevube_wusavagidog.pdf
- http://webmail.t2troubleshooting.com/uploads/1/3/2/3/132302928/terms.html
- http://webmail.t2troubleshooting.com/uploads/1/3/2/3/132302928/dmca.html
- http://webmail.t2troubleshooting.com/uploads/1/3/2/3/132302928/policy.html
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://bebeleg.files.wordpress.com/2020/05/73582496289.pdf
- https://bolivuxane.files.wordpress.com/2020/05/401717374.pdf
- https://jupeveni.files.wordpress.com/2020/05/muporifosifare.pdf
- https://buwivimew.files.wordpress.com/2020/05/fokorukeviwulerogarugurut.pdf
- https://mizarexil.files.wordpress.com/2020/05/mokumefumevederanodelejuk.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/
- http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005aed.bin` `b515650c768ac9a103e93a76789f6f84fb3f0f657033181f1856aa5604c8ae4c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5AED	10644 bytes

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