PDF malware analysis — malicious · 2d53b884295e24b4

MALICIOUS

PDF

90.2 KB Created: 2020-04-14 01:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 10264e505f46ac87e942ed14a1437382 SHA-1: b25da9964b89ceea7e300f9aa4d18249b839f7d6 SHA-256: 2d53b884295e24b4594cc4073f700679746599fddb7dfc2f61af4b2d1beb114a

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 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 classifier also strongly indicated maliciousness. The embedded URLs suggest a link farm or redirection scheme, likely intended to distribute further malicious content or engage in SEO spam. No scripts were extracted from this sample.

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://christinafriedle.org/uploads/1/3/1/4/131406433/131406433.html#boundary+layer+concept+in+fluid+mechanics+pdf
- http://pace-bisonpointeinfo.com/uploads/1/3/0/4/130488288/xezosijepuruxama.pdf
- http://skookumchuckpublishing.com/uploads/1/3/1/0/131070539/gidebi.pdf
- http://joshandaprilbrand.com/uploads/1/3/1/3/131398154/addf21c4e.pdf
- http://thundermountainsporthorses.com/uploads/1/3/0/6/130621164/6830624.pdf
- http://bubblydogsdr.com/uploads/1/3/0/7/130739223/971397.pdf
- http://josie-johnson.com/uploads/1/3/0/4/130488096/suwojitu.pdf
- http://jyldarelooklda.com/uploads/1/3/1/4/131406381/patevisopug.pdf
- http://www.naardedraai.st-er.nl/uploads/1/3/0/5/130589174/2664048.pdf
- http://alexanimations.com/uploads/1/3/0/7/130738534/kekegebefit_dumevopimu_kexovopakemu.pdf
- http://tutump.com/uploads/1/3/0/7/130738830/2495116.pdf
- http://bluebirdinspectors.com/uploads/1/3/0/4/130476766/1530282.pdf
- http://vladtheinventor.org/uploads/1/3/1/4/131456191/tejititatikepiw.pdf
- http://www.naardedraai.st-er.nl/uploads/1/3
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000109ca.bin` `b9f736e9ffee897beb06feab90e11f338a63018ccba836bda457204f4878427b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109CA	1944 bytes
`font_01_sfnt_off000112b1.bin` `20c8dd253c6135b9d518702c939c093afc8429487e19b5fe07bb29d0caae25e6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112B1	9140 bytes
`font_02_sfnt_off000134b6.bin` `5fac913ec642ef1d3a61731a1c5243721795ed50c985af558cb3c7793a424e29`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134B6	4520 bytes
`font_03_sfnt_off000143e5.bin` `4c8702bf2685272063a126a2ed0cce728640a3d7461b6ba13d31dc0864862f94`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x143E5	16084 bytes

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