PDF malware analysis — malicious · 715dd56c85408076

MALICIOUS

PDF

30.6 KB Created: 2020-06-07 00:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d15bc92c05e3c0142a14d475c707eff2 SHA-1: 4ceaa7bb695a5e95e849012ef4d4339b00e2861f SHA-256: 715dd56c8540807656aff725b0cf2ae1358e34c9e1e15324b45d7bf933f2d666

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to dropping or redirecting to further stages. No scripts were extracted, and the document body is heavily obfuscated, but the sheer volume of external links is the primary indicator of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
ClamAV: Pdf.Dropper.Agent-8646760-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-8646760-0
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://murraywhiteley.com/uploads/1/3/0/7/130776025/130776025.html#problemas+de+optimizacion+2+bachille
- http://tamtamstitches.net/uploads/1/3/1/6/131606305/datubu.pdf
- http://hastingslaw-llc.com/uploads/1/3/0/6/130639751/7848851.pdf
- http://queen.care/uploads/1/3/0/6/130620412/5462479.pdf
- http://m.jpurquizapipes.com/uploads/1/3/0/2/130289749/5034656.pdf
- http://opferderwirtschaft.com/uploads/1/3/0/8/130873810/8594026.pdf
- http://myadventuresintravel.com/uploads/1/3/0/4/130488861/bovem.pdf
- http://mail-av.guidaturisticapadula.it/uploads/1/3/0/5/130551468/9605385.pdf
- http://donalddistrictone.com/uploads/1/3/1/8/131856715/882a2ac2e686f55.pdf
- http://allineverymoment.com/uploads/1/3/0/7/130738657/5473552.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://pemorezi.files.wordpress.com/2020/06/12178052881.pdf
- https://wuzonatu.files.wordpress.com/2020/06/86190007181.pdf
- https://jaxevugem.files.wordpress.com/2020/06/jamiterazadukidewireziwe.pdf
- https://sotuxaxo.files.wordpress.com/2020/06/23189907012.pdf
- https://napipavuk.files.wordpress.com/2020/06/zuratogunigawotuze.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_off00004b3d.bin` `2f4e3f7b1ac588e25d406a4df6fa8f2281e33582a71d48b2011fadad03494e20`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4B3D	10392 bytes

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