PDF malware analysis — malicious · 546647e5899d9d38

MALICIOUS

PDF

46.7 KB Created: 2020-03-29 10:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 2340a4df5907c7bed825d5673045e88b SHA-1: 8cf124d1ed26d83345c32431edf1ef395cdaa6ee SHA-256: 546647e5899d9d38237efb8a689fa08eb17873cf051e1bc87cf0677d585725ec

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains a mix of metadata and what appears to be a link farm, further supporting the malicious intent. No scripts were extracted from this sample.

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://moodlabnewlife.nl/uploads/1/3/0/7/130738526/130738526.html#diferencia+entre+educacion+y+pedagogia+wikipedia
- http://alexdanielski.com/uploads/1/3/0/6/130604740/a6d6acce969ab.pdf
- http://www.westshoreland.org/uploads/1/3/0/8/130813785/2c4ff02ba.pdf
- http://je-advisory.com/uploads/1/3/0/5/130539130/bamenagajesaw.pdf
- http://pantherlakenc.com/uploads/1/3/0/6/130604218/toruxatakepigutuvi.pdf
- http://treeverwood.com/uploads/1/3/0/3/130379143/dalakudadis-sumobagefewise-toxevasolejanud-ridegaxitiduw.pdf
- http://jpm3i.com/uploads/1/3/0/7/130776340/zunofor-nexidosobin.pdf
- http://solarpowermidatlantic.net/uploads/1/3/0/8/130813780/jotejemetijezoga.pdf
- http://microcomponent.no/uploads/1/3/0/7/130738979/8f23b77.pdf
- http://tawindowtreatments.com/uploads/1/3/1/0/131070567/7003858.pdf
- http://pinupanddance.com/uploads/1/3/0/5/130551765/ca896002b18d7.pdf
- http://fsnederland.nl/uploads/1/3/0/4/130488583/visekevoj.pdf
- http://www.rlx.space/uploads/1/3/0/5/130550657/rujikudolu.pdf
- http://pamperpartybundaberg.com/uploads/1/3/0/6/130621310/41279f.pdf
- http://www.gaycollegeweekend2012.com/uploads/1/3/0/6/130620410/5356923.pdf
- http://piropeandopueblo.com/uploads/1/3/0/3/130313190/sixirotuviruzub_bumomikilatepik_jasedojerate.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00007645.bin` `32f6ff15651082e7366e092817eb3979ac45e06216302959edef3c108524a75c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7645	8624 bytes
`font_01_sfnt_off000095c9.bin` `f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x95C9	16204 bytes

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