Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f73efbbce18b61…

MALICIOUS

PDF

39.3 KB Authoring application: PDFedit
MD5: 1aea3af004a690c8951e13f6ded92b0f SHA-1: 79dddd40f238c0d19ab93f1222ae3d89b222cfab SHA-256: 91f73efbbce18b61be5dde398d33acc031dcd2cdc54d6d2fc4f0115b17e3daf3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URLs are the primary indicators of compromise, likely serving as lures or download locations for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://trushop.icu/uploads/2020/01/29/nebulepirupuv.pdf
    • http://vocescuola.org/uploads/1/3/0/6/130620909/9947898.pdf
    • http://mxwdjty.com/uploads/1/3/0/4/130488483/7460c86.pdf
    • http://rileysfullservice.com/uploads/1/3/0/5/130541744/pujagawif.pdf
    • http://bukawuzewo.tovarug.icu/uploads/2020/01/28/9c322410c020.pdf
    • http://moheal-moringa.com/uploads/1/3/0/2/130289336/605e46a55012d7.pdf
    • http://realty33nj.com/uploads/1/3/0/6/130640081/00d1d9a0.pdf
    • http://rulotefo.planbani.ru/uploads/2020/01/29/domedimexaxulo.pdf
    • http://namoidesigns.com/uploads/1/3/0/5/130545098/kemapije_wofamosuka_woturupowog.pdf
    • http://kesojaf.freepubg.shop/uploads/2020/01/29/nobuzuxo.pdf
    • http://bronxlandlordattorney.com/uploads/1/3/0/3/130379777/dafumekakujin_sumot_naneb.pdf
    • http://taraletsgo.net/uploads/1/3/0/2/130270914/9850602.pdf
    • http://daybreakerstest.com/uploads/1/3/0/3/130313194/df97aa10.pdf
    • http://nanasrabbitry.weebly.com/uploads/1/3/0/4/130490053/83a4177e01579.pdf
    • http://northeastmaterials.com/uploads/1/3/0/6/130620520/d39f4.pdf
    • http://youngatartmn.com/uploads/1/3/0/6/130639364/tolopoxit_dijedomada_favurupimuwesix.pdf
    • http://gegi.repuljvelunk.website/uploads/2020/01/28/sopov-toguze.pdf
    • http://wortexmovies.com/uploads/1/3/0/6/130605358/cc845ead3140a.pdf
    • http://starvegutfarm.com/uploads/1/3/0/6/130603737/lewugik-wavodevonuku-rarow.pdf
    • http://nataliamcabrera.com/uploads/1/3/0/2/130287936/piguxalivifejidugaji.pdf
    • http://almostathirdgrader.com/uploads/1/3/0/5/130588360/waxolibume-gurujax-zizikadiw.pdf
    • http://votetada.vetriks.com/uploads/2020/01/28/1790280.pdf
    • http://coachrenee2u.com/uploads/1/3/0/3/130313220/1892dfecc5.pdf
    • http://10thirtychoir.org/uploads/1/3/0/6/130604923/xapabodes.pdf
    • http://nep.stoneprocessingtool.ru/uploads/2020/01/28/moxularive_segaxura_sonumo_zeninadegov.pdf
    • http://nupelicanparty.org/uploads/1/3/0/6/130639851/130639851.html#jurnal+ampas+kopi+pdf
    • http://daybreakerstest.com/uploads/1/3/0/3/13031

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001743.bin
e45d6f8ba2fd784f87bedffbd4fd43d58a1f5342ca0a46491a5664ed9e2182d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1743 7540 bytes

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