PDF malware analysis — malicious · 68ae11d7ecdf80f3

MALICIOUS

PDF

54.0 KB Created: 2020-04-08 19:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: a905cc17186f01aade93e379cfd82f22 SHA-1: 38b41bc6f7358dfdede7c588e567d2cc15d869da SHA-256: 68ae11d7ecdf80f3db37084a031f2238c3d8941e7b98e2b2f8ad5472025538b2

136 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 unrelated domains. This pattern is indicative of a link farm or a mechanism to distribute malicious content or SEO spam. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports this assessment. No scripts were extracted, but the PDF structure itself is used to host these links.

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.
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://antiviruseprotectserviceonline.site/uploads/1/3/0/7/130740444/130740444.html#quete+principale+wakfu
- http://ayemade.scot/uploads/1/3/0/7/130739781/4564064.pdf
- http://www.gobylivi.com/uploads/1/3/0/6/130620431/nuranedumiw.pdf
- http://jogihorse.com/uploads/1/3/0/7/130739775/b7f525c06119d.pdf
- http://lagentities.com/uploads/1/3/0/3/130313218/7164186.pdf
- http://samsung.nyc/uploads/1/3/0/9/130968933/6528748.pdf
- http://jedawellnest.com/uploads/1/3/1/4/131453603/ketanunebusolep.pdf
- http://cpanel.qulinarnia.com/uploads/1/3/0/5/130551004/fajonoraberarid.pdf
- http://espacefleursetdeco.com/uploads/1/3/0/8/130874136/6058419.pdf
- http://candlecabinbandb.com/uploads/1/3/0/5/130588733/f42e69.pdf
- http://jessicaknott.com/uploads/1/3/0/6/130621765/pijineridovujup_nuwav_rurug.pdf
- http://doorandwindowplus.com/uploads/1/3/0/6/130639975/406341.pdf
- http://faithandenergy.org/uploads/1/3/0/4/130488574/zowasebosavivolim.pdf
- http://homesteadministries.org/uploads/1/3/0/8/130814584/95079.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000a57d.bin` `9e9eaa25e20dae12b2ad58d9bf8514fddbdad4e645b780ba68272b574e7cbc4a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA57D	10552 bytes

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