PDF malware analysis — malicious · 756ed827895cc647

MALICIOUS

PDF

44.9 KB Created: 2020-03-30 11:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: e1442c19e035e6c99e6084221352fe2e SHA-1: 633896020115a91059cc40d128eb2f06abe07011 SHA-256: 756ed827895cc6473899c1b7a0d2fa552c8e5908c28b786392fd673712222732

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm or SEO spam, containing numerous external links to other PDF documents hosted across various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass of external links. The embedded URLs suggest a potential attempt to drive traffic or distribute further malicious content, aligning with a spearphishing attachment vector.

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://oakclass.com/uploads/1/3/1/0/131070481/131070481.html#electrolisis+del+agua+ecuacion+redox
- http://hhmaps.com/uploads/1/3/1/0/131070591/vinotifiradebogu.pdf
- http://ericdietrich.com/uploads/1/3/0/5/130545985/lodogaximodoxas.pdf
- http://failedbuddhist.com/uploads/1/3/0/3/130313440/556765.pdf
- http://scottrude.com/uploads/1/3/0/3/130313319/niwivajapizakukawo.pdf
- http://dianebanner.com/uploads/1/3/0/7/130740330/f1a24d.pdf
- http://albanyimprov.com/uploads/1/3/0/4/130490833/menipedebelaniv.pdf
- http://unwindpolefitness.com/uploads/1/3/0/9/130968993/zeniloboxesimu-tewas-vedinuvod.pdf
- http://mineralcapital.net/uploads/1/3/1/0/131071035/d7dcef4ee.pdf
- http://mail.phillybailout.com/uploads/1/3/0/3/130323552/323567.pdf
- http://mauleparts.com/uploads/1/3/1/0/131070096/28fc069aab48fd6.pdf
- http://motassist.com/uploads/1/3/0/2/130272985/9334337.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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/
- https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000063be.bin` `f15e9f32b4e155c4f11be273e6ed80f01442bd3aed74d99e4bf443466581ad10`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63BE	9096 bytes
`font_01_sfnt_off00008526.bin` `aa7fdfe40e4f7f9f3cbd67d8e05dadc7b6cee87de2ab410c71264085772dacd6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8526	3196 bytes
`font_02_sfnt_off0000901e.bin` `1aa9c189c614185d050cf0c7c76bf78cc97f6f4c6bb7e9d3659a72a5ef9a1495`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x901E	16276 bytes

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