Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c99df35a872850…

MALICIOUS

PDF

47.1 KB Created: 2020-03-30 07:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e395f67fe5e9087081c26ec2b18653b2 SHA-1: 8c649b2fe129feff71dc81073017f0b4722e9f24 SHA-256: b5c99df35a872850e8fd55346e8e1f6762c953bb81ac8f2cef5c64b1a42a20e4
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are numerically or generically named, suggesting a link farm or SEO spam operation. The document body references 'My brilliant friend episode 1 online', a lure to direct users to the embedded URLs. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern.

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://mystylesheets.com/uploads/1/3/1/4/131454158/131454158.html#my+brilliant+friend+episode+1+online
    • http://whatsheet.com/uploads/1/3/0/4/130436451/leseritefamane.pdf
    • http://michaelmkrueger.net/uploads/1/3/0/9/130969816/wawazovuji-fonaziw-nokafago-wofufasamasuzut.pdf
    • http://alston.de/uploads/1/3/0/5/130588244/c501565da91432.pdf
    • http://restitched.com/uploads/1/3/0/2/130287542/9589d02b9964fd8.pdf
    • http://waterwisdomak.com/uploads/1/3/0/6/130620858/6d4fa.pdf
    • http://palmettodecals.com/uploads/1/3/0/2/130289755/8914839.pdf
    • http://summitresumes.net/uploads/1/3/0/6/130605065/moxilulob.pdf
    • http://ilawnmowing.com/uploads/1/3/0/5/130543107/3431989.pdf
    • http://journeysouthbay.com/uploads/1/3/0/6/130639147/215b1202.pdf
    • http://vsemdaryu.site/uploads/1/3/0/8/130873833/44ba2d8.pdf
    • http://closetgarageenvy.net/uploads/1/3/0/6/130622059/9d741.pdf
    • http://empowerfl.com/uploads/1/3/0/4/130435551/zesini.pdf
    • http://overtherainbowrva.com/uploads/1/3/0/6/130621441/savuzinaribe_kogofov.pdf
    • http://kkpsisedaa.org/uploads/1/3/1/1/131163872/vowolo_kekepofunezov.pdf
    • http://pineislandvacationrental.com/uploads/1/3/0/6/130604486/fc2b0a9.pdf
    • http://areducationalsolutions.com/uploads/1/3/0/2/130272452/7685275.pdf
    • http://fincherfamily.com/uploads/1/3/0/3/130323164/faa556a401a.pdf
    • http://coachstephbcom.com/uploads/1/3/0/3/130323767/7870678.pdf
    • http://salinaschurchofgod.org/uploads/1/3/0/5/130544872/nugej.pdf
    • http://weigaonano.com/uploads/1/3/0/4/130436152/71e22e.pdf
    • http://nicolanotes.com/uploads/1/3/0/7/130776828/ruwokusinu.pdf
    • http://leotardipromowear.com/uploads/1/3/0/2/130288707/xemubulaxofagut.pdf
    • http://polymer-all.com/uploads/1/3/0/6/130620917/fipidoxetita_gowonep_piponux.pdf
    • http://ctbodyworx.com/uploads/1/3/0/3/130379067/nopogi-devisoj.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_off00008ee1.bin
ed75668570c36549649e20362d4982092699111b1a7ddbc40f7192ff389d9808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE1 8328 bytes

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