PDF malware analysis — malicious · 03527e8109a8f788

MALICIOUS

PDF

32.6 KB Created: 2020-06-03 02:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 47c37f1197d101f0bcbbac3279b118d3 SHA-1: 14d710e255b8fcf96ad0ac3e9e4a644122df717c SHA-256: 03527e8109a8f7885e07d3dc139bdd29710cb032e8eed8f7ea98839f7fe9fea7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, identified as a PDF link farm. The primary URL points to a page that appears to be related to graphing linear equations, but the majority of the embedded links lead to other PDF files hosted on various domains. This suggests a tactic to manipulate search engine results or to distribute further malicious content. No scripts were extracted, and the document body is heavily obfuscated, limiting direct analysis of its intent beyond the link farm.

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://bayflier.com/uploads/1/3/0/7/130739885/130739885.html#graphing+linear+equations+worksheet
- http://parkourundervisning.dk/uploads/1/3/0/4/130489149/joluwu.pdf
- http://gablesentrance.com/uploads/1/3/0/2/130271077/puzaleris.pdf
- http://leestraders.com/uploads/1/3/1/3/131380688/7039230b2.pdf
- http://avidandiyafinejewels.com/uploads/1/3/1/4/131482884/vujowovedikilu-mimawa.pdf
- http://providencebaseballacademy.com/uploads/1/3/1/6/131636577/safimizowavifufu.pdf
- http://grandrapidstowingcompany.com/uploads/1/3/0/5/130551083/404014.pdf
- http://joanturner.org/uploads/1/3/0/7/130775169/0c368a5a11c91.pdf
- http://8c.undesirable.us/uploads/1/3/0/3/130313178/xazimomigogunubuv.pdf
- http://bayflier.com/uploads/1/3/0/7/130739885/terms.html
- http://bayflier.com/uploads/1/3/0/7/130739885/dmca.html
- http://bayflier.com/uploads/1/3/0/7/130739885/policy.html
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://wopigumu.files.wordpress.com/2020/05/60510200509.pdf
- https://razekusokil.files.wordpress.com/2020/05/78151146782.pdf
- https://xaloxef.files.wordpress.com/2020/06/lufatuwoxowawutuxanovaner.pdf
- https://kuzulod.files.wordpress.com/2020/05/69410475402.pdf
- https://susaretekitu.files.wordpress.com/2020/06/30816341606.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_off000054ff.bin` `17df4224159bc55000768291ed17186c7b19542ec96bbc916e7894bb00a16274`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x54FF	9876 bytes

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