PDF malware analysis — malicious · 2a77de838bc58dc7

MALICIOUS

PDF

51.5 KB Created: 2020-03-12 11:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: e54e285d248f007e8b452ca3980c3be8 SHA-1: e27c1c320535f855f8a536fcd0fe0dcc8f125bfb SHA-256: 2a77de838bc58dc767778616c7850042317e97d1b99d46c59535dd76cc10c709

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent. The document body, though partially corrupted, contains text related to 'Greater trochanteric bursitis' and the wkhtmltopdf application, suggesting a lure document. The primary attack pattern involves directing users to a network of linked PDF files hosted on numerous domains.

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://lanie-logan.rominastiebenphotography.com/uploads/1/3/0/6/130604411/130604411.html#greater+trochanteric+bursitis
- http://alleylouisville.com/uploads/1/3/0/7/130740202/dixisu.pdf
- http://mta-sts.mariacfox.com/uploads/1/3/0/7/130774990/kerimoxugonuxel.pdf
- http://1freedomrealestateinvestor.com/uploads/1/3/0/5/130543840/741c1b3b7d.pdf
- http://sophieandbenadventures.com/uploads/1/3/0/2/130287727/8d2ffd2c.pdf
- http://psychedelicsmadnessawakening.com/uploads/1/3/0/6/130604789/vimazewuted.pdf
- http://mitzimileskubota.com/uploads/1/3/0/2/130289523/ketubukeji_setew_pabadolaku_kavowiwujitug.pdf
- http://bridesewbeautiful.org/uploads/1/3/0/2/130271043/1165387.pdf
- http://emmareneebradford.com/uploads/1/3/0/4/130483653/2268905.pdf
- http://appartementverhuur.com/uploads/1/3/0/5/130590295/2705978.pdf
- http://s3platform.org/uploads/1/3/0/3/130313718/ximejasilefogewejo.pdf
- http://treasurehuntergame.com/uploads/1/3/0/3/130312951/gedaganuxeru-bujuzajuji-bapigalomesaku.pdf
- http://demenagementlanationale.com/uploads/1/3/0/6/130604804/mefulomose.pdf
- http://www.foreverroyalinc.com/uploads/1/3/0/8/130813877/0f87d.pdf
- http://kenplume.net/uploads/1/3/0/3/130379210/173128.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_off00009821.bin` `40a680bfcc00025f61dbca81bf8edcd272e209fac3bc2abb4eb67823364971cc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9821	7912 bytes
`font_01_sfnt_off0000b6ff.bin` `e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6FF	2652 bytes

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