PDF malware analysis — malicious · 864ec30b6de9641f

MALICIOUS

PDF

40.0 KB Created: 2020-03-30 13:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 013071dd6e7d31828a0c6bc7387f1e31 SHA-1: da4df80a2d12eb8f93dfd7d77ac6b1387ccd68e1 SHA-256: 864ec30b6de9641ff298aacd1974c91391575c6e7aad929302332a81a895c58b

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, suggesting a link farm or redirection mechanism. The document body, though partially obfuscated, contains a URL that appears to be a lure for users seeking chapter answers. The ML classifier strongly indicates malicious intent, likely to drive traffic to malicious sites or distribute further payloads.

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://cityonloc.com/uploads/1/3/0/6/130620185/130620185.html#cc3+chapter+9+answers
- http://sunfamily.xyz/uploads/1/3/0/5/130550781/f85192c.pdf
- http://biofieldtherapy.net/uploads/1/3/1/3/131379343/5279449.pdf
- http://captainsensory.com/uploads/1/3/0/4/130475892/fufulutodavimawil.pdf
- http://ageless-wellbeing.com/uploads/1/3/0/5/130589202/5772099.pdf
- http://wundrmediapro.com/uploads/1/3/1/3/131380001/gawaderopojaxumotixu.pdf
- http://nickminion.com/uploads/1/3/0/2/130270957/8895785.pdf
- http://scservicesky.com/uploads/1/3/0/5/130550868/7147569.pdf
- http://happytales.online/uploads/1/3/0/4/130489343/908193.pdf
- http://9f60hpk065.com/uploads/1/3/0/5/130543156/989332.pdf
- http://boilerisland.com/uploads/1/3/0/6/130603905/gubil.pdf
- http://round4boxing.com/uploads/1/3/0/6/130640191/f3033ee41a594.pdf
- http://tiferetmiami.com/uploads/1/3/0/6/130639613/2512098.pdf
- http://mikefosterstunts.com/uploads/1/3/0/5/130550855/kozipasimaka-nigivava.pdf
- http://saladextraveganza.com/uploads/1/3/0/7/130776219/d6ee5b2df2dfb.pdf
- http://tweezty.com/uploads/1/3/0/4/130489367/8226285.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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/
- https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006834.bin` `a61f963b2bcd5749dfbd44e58937fc67d57da5a49d793c9d829568d0244df7ef`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6834	8044 bytes
`font_01_sfnt_off0000878c.bin` `e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x878C	2652 bytes

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