PDF malware analysis — malicious · 00538709a51f40b3

MALICIOUS

PDF

39.9 KB Created: 2020-03-28 06:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 24569875d2d6b18cbc9b9a77d6f2f1c2 SHA-1: 88a353b3759c8cebf204ef947f3659e9934e0a80 SHA-256: 00538709a51f40b3a67699dfc78f412f4340b0ba1bef5647617ed5b9e3305bb2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a dropper or downloader. The document body, while containing a lure about retired teachers, is heavily obfuscated and primarily serves to host these malicious 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.
ClamAV: Pdf.Dropper.Agent-9025141-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-9025141-0
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://roadwaytrafficcontrol.com/uploads/1/3/0/7/130738825/130738825.html#reconocimientos+editables+para+maestros+jubilados
- http://www.adamendriukaitis.com/uploads/1/3/0/7/130740440/xavelex_wevidodonefu_riwabaxil_tefopu.pdf
- http://jaxonmings.com/uploads/1/3/0/9/130969790/3426016.pdf
- http://mta-sts.cherylcoon.com/uploads/1/3/0/5/130588729/zotebosisisedo.pdf
- http://mta-sts.mail.earthcarefarm.com/uploads/1/3/0/9/130969945/numepazedebar-lutukexexu.pdf
- http://mobadanceacademyus.com/uploads/1/3/0/7/130775259/87f1ca8.pdf
- http://synod-sl.info/uploads/1/3/0/6/130604844/996531.pdf
- http://k23partsandequipmentllc.com/uploads/1/3/0/4/130492889/piturowuritutu.pdf
- http://lspropertymaintenance.com/uploads/1/3/0/2/130288926/jixazaderavoxafep.pdf
- http://epimakeupartist.com/uploads/1/3/0/6/130621055/ac126da4d.pdf
- http://5280autoglass.com/uploads/1/3/0/5/130589396/buxata_nisomedifomikij_vajapapibux.pdf
- http://nicolejzimmer.com/uploads/1/3/0/2/130289558/foruwaxulawuj.pdf
- http://www.alexvais.com/uploads/1/3/0/6/130621376/079738fffec1.pdf
- http://micromis.com/uploads/1/3/0/4/130483067/7377174.pdf
- http://kunstglad.no/uploads/1/3/0/7/130775570/9bda93e128408af.pdf
- http://stricklandskennels.net/uploads/1/3/0/5/130588980/b1e757f8.pdf
- http://www.browniesdiving.com/uploads/1/3/0/6/130621285/nuluvokid-sigave.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_off00007132.bin` `90eb5628023b0f8f583c45f9b1790b28b8351701238ae83253585efe9298bbe5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7132	9088 bytes

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