Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e594a25ce70c1f…

MALICIOUS

PDF

40.4 KB Created: 2020-03-27 03:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2f64dafb601c4880ef437650b454e69 SHA-1: fe2c49e1e59170bf009816b316258ca3b5555ae2 SHA-256: 88e594a25ce70c1f22bdb003a54c2708931202a56e65fd1ac5216acefbda615e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or SEO poisoning tactic, designed to drive traffic to potentially malicious or low-quality content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body text is largely unreadable binary data, but the presence of numerous external links is the primary indicator of malicious activity.

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://starrmark.net/uploads/1/3/1/3/131380625/131380625.html#cual+es+la+estructura+de+una+oracion+interrogativa+en+ingles
    • http://sang-bleu.com/uploads/1/3/0/5/130550778/ca22461148ab5.pdf
    • http://eco2oils.com/uploads/1/3/0/4/130476298/jafawumazubenunofed.pdf
    • http://davidjohnhamm.com/uploads/1/3/0/6/130640218/4339845.pdf
    • http://bankmills.com/uploads/1/3/0/3/130313193/kuwaba.pdf
    • http://winxkid.com/uploads/1/3/0/3/130379921/zesutag.pdf
    • http://morrowworldpost.com/uploads/1/3/0/2/130289254/5702080.pdf
    • http://ceid.co/uploads/1/3/0/5/130541133/jasonafudig.pdf
    • http://www.abbeyvalvanophd.com/uploads/1/3/0/6/130639443/7f5f666.pdf
    • http://beachhousemedia.us/uploads/1/3/0/5/130551554/kakekaxixupoxukadu.pdf
    • http://newlifedestination.com/uploads/1/3/0/7/130775411/7435947.pdf
    • http://shambling-shimmies.com/uploads/1/3/0/2/130271132/vatizuwevazobik.pdf
    • http://the-hemp-life.com/uploads/1/3/0/5/130540699/9809639.pdf
    • http://exeunt.org/uploads/1/3/0/5/130543685/9418238.pdf
    • http://mrsfantinsclass.com/uploads/1/3/0/6/130604354/8f9126c9d.pdf
    • http://tomandrachelwedding.com/uploads/1/3/0/7/130738956/94bb35146675d9.pdf
    • http://www.pactumperfect.com/uploads/1/3/0/6/130639170/51455.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.

FilenameKindSourceSize
font_00_sfnt_off0000710a.bin
5b13fe38f2cfa3ad850fbe900d8f6bd2787becf058ae9029565a34df1b7fc427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710A 9008 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.