Malicious PDF — malware analysis report

Static analysis result for SHA-256 74453dcc7fbc60e8…

MALICIOUS

PDF

37.6 KB Authoring application: Smallpdf Desktop
MD5: 8b5def7dfe0c884d81b77c0a0b3391fb SHA-1: 8132dc13a159ac6c4afab8da3c5c3708637bd03d SHA-256: 74453dcc7fbc60e8af977e09a968cf00440392cf27ef1ce27e346d6a64a0b8f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This suggests a tactic to manipulate search engine results or to distribute further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as phishing-related malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://jellytel.com/uploads/1/3/0/4/130436458/53f94c21.pdf
    • http://www.eastern-shore-stories.org/uploads/1/3/0/7/130775563/gumudef_guzos_tagov.pdf
    • http://www.belterosgoatranch.com/uploads/1/3/0/6/130603803/3462839.pdf
    • http://www.pnl-therapy.com/uploads/1/3/0/7/130776611/kavusu.pdf
    • http://ceipvirgencandelaria.com/uploads/1/3/0/4/130435888/gulufizofuvos.pdf
    • http://vacationsbythesea.net/uploads/1/3/0/2/130289196/xumebizajaxifi-rogojejulul.pdf
    • http://bowman-landscaping.com/uploads/1/3/0/4/130477864/8818424.pdf
    • http://hostmaster.alchemyhealingarts.com/uploads/1/3/0/4/130489222/4677131.pdf
    • http://www.iavnt.net/uploads/1/3/0/9/130969062/7ec79.pdf
    • http://www.cakebatterblondie.com/uploads/1/3/0/7/130775724/5cc12321545ae.pdf
    • http://myidealventures.com/uploads/1/3/0/5/130551585/e6f7a.pdf
    • http://yakwelicosmeticsandmakeup.com/uploads/1/3/0/5/130540868/3356450.pdf
    • http://noirnooga.net/uploads/1/3/0/6/130604869/1176791.pdf
    • http://balbiscompetitionsuits.com/uploads/1/3/0/6/130639837/rufumus_rixatebuz_zarude_venitaxuw.pdf
    • http://okc-spw-01.ad.laso.org/uploads/1/3/0/2/130273846/tubeteki-dokegenegexido-japotuv.pdf
    • http://booksigningsusa.com/uploads/1/3/0/4/130488574/lekenujuromo-nagij-gerupimine.pdf
    • http://christiancoelho.com/uploads/1/3/0/2/130289629/15ebee42.pdf
    • http://cfhmhawaii.com/uploads/1/3/0/6/130603874/pikumikunuf_fogiroj_sopupivanomaf.pdf
    • http://qmhle.bpmtc.com/uploads/1/3/0/7/130740202/130740202.html#5+stages+of+grief+kubler+ross+book

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003596.bin
4e28f86202ca562c31cfb33c64a44f97941a6d30599da11052a4854a6b34fb5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3596 7788 bytes

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