PDF malware analysis — malicious · 6670386bc5808c63

MALICIOUS

PDF

41.8 KB Created: 2020-03-29 21:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 830c090fe29363f18915831b11661962 SHA-1: 48601feebf2c2f76faff82a159925e6258d39d1a SHA-256: 6670386bc5808c637b16f4103dc4712c6db158d088de6ddeb6dfc1025ed60403

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a link farm, pointing to various PDF files hosted on different domains. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute additional malicious content via these links. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://74-123-78-154.mgwnet.com/uploads/1/3/0/7/130775911/130775911.html#a+room+of+one%27s+own+chapter+3+text
- http://shakespearerevuecompany.com/uploads/1/3/0/4/130476661/juvemomurudene.pdf
- http://fairytalesandwar.net/uploads/1/3/0/9/130969623/fedugezobujot.pdf
- http://chefsplatemalta.com/uploads/1/3/0/2/130287872/tukoxedarutufad.pdf
- http://nourishhealthservices.com/uploads/1/3/0/2/130270762/dovugujakopima_rozujevow_zegimejirimidov_kewogoruxejofew.pdf
- http://perspectivesinhumanservices.com/uploads/1/3/0/5/130590537/xobijirigiv-pugefe.pdf
- http://mediardenne-services.com/uploads/1/3/0/3/130379237/b7c6d3.pdf
- http://cutlerjewelers.com/uploads/1/3/0/3/130379479/bonepomenoruseketuxo.pdf
- http://legendarypearls.org/uploads/1/3/0/6/130622092/gesuf-zitinazozu.pdf
- http://computerhelpbutton.com/uploads/1/3/0/6/130604877/8ccbe1bcf7f13.pdf
- http://stellarnonprofits.com/uploads/1/3/0/8/130815303/9205523.pdf
- http://clearsignsinterpreting.com/uploads/1/3/0/5/130590058/6407362.pdf
- http://kotihoitopriimus.fi/uploads/1/3/0/6/130621333/6975606.pdf
- http://nelsonandwiseadvisors.com/uploads/1/3/0/4/130488544/7145787.pdf
- http://pathogenassassin.com/uploads/1/3/0/8/130873957/vinawo.pdf
- http://dapperdogskoolkats.com/uploads/1/3/0/3/130312991/waxaburovon_mubekasonara_nafej_zexojut.pdf
- http://membershipinsight.com/uploads/1/3/0/6/130621642/7124358.pdf
- http://felishahodges.com/uploads/1/3/0/9/130969370/28c2d.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_off00007e09.bin` `37933f4c325725bee7ff0b9d1960043f8b5e3808bd82601f6f8f30894559e4fb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7E09	7128 bytes

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